How to Install and Activate a USA eSIM: Step by Step Guide for iPhone and Android
Roami Team
Roami helps travelers stay connected with simple eSIM plans.
📑 Table of Contents
You bought a USA eSIM. Now you need to get it working on your phone. The good news is it’s straightforward — most people go from purchase to connected in about 5 minutes.
This guide walks through every step: checking phone compatibility, buying the right plan, installing the eSIM profile, configuring dual SIM settings, and fixing common problems if something doesn’t work. If you haven’t chosen a provider yet, the USA eSIM ranking comparison can help you pick one first.
For travelers who want a simpler setup experience, a USA eSIM with automatic carrier switching can handle network selection for you — no need to manually toggle between T-Mobile, AT&T, or Verizon.
All instructions are based on iOS 18 and Android 15. Older versions may have slightly different menu names.
If you want to practice the whole setup process risk-free before your trip, Roami’s free eSIM trial walks you through every step without any commitment. Code WEB20 takes 20% off any plan.
How to check if phone supports eSIM for USA
Not all phones work with eSIM. Before buying a plan, confirm yours is compatible. This is the first and most important step in the USA eSIM installation process.
Quick check: Dial *#06# on your phone. If you see an EID number (usually 32 digits) listed alongside the IMEI, your phone supports eSIM. The GSMA’s official eSIM specifications confirm this is the standard identifier for eSIM-capable devices.
USA eSIM compatible devices: iPhone
Apple’s compatibility page confirms these iPhone models support eSIM:
| Model | eSIM Support | Notes |
|---|---|---|
| iPhone 16 series | ✅ | All models (except China/HK/Macau) |
| iPhone 15 series | ✅ | All models (except China/HK/Macau) |
| iPhone 14 series | ✅ | All models (except China/HK/Macau) |
| iPhone 13 series | ✅ | All models (except China/HK/Macau) |
| iPhone 12 series | ✅ | All models (except China/HK/Macau) |
| iPhone 11 series | ✅ | All models (except China/HK/Macau) |
| iPhone XS / XS Max / XR | ✅ | All models (except China/HK/Macau) |
| iPhone X and earlier | ❌ | No eSIM support |
USA eSIM compatible devices: Samsung
| Model | eSIM Support | Notes |
|---|---|---|
| Galaxy S24 / S24+ / S24 Ultra | ✅ | All regions |
| Galaxy S23 / S23+ / S23 Ultra | ✅ | All regions |
| Galaxy S22 / S22+ / S22 Ultra | ✅ | All regions |
| Galaxy S21 / S21+ / S21 Ultra | ✅ | All regions |
| Galaxy S20 / S20+ / S20 Ultra | ✅ | All regions |
| Galaxy Z Fold series | ✅ | Fold 3 and newer |
| Galaxy Z Flip series | ✅ | Flip 3 and newer |
| Galaxy A series | ⚠️ | Selected models only (A54, A34) |
USA eSIM compatible devices: Google Pixel
| Model | eSIM Support | Notes |
|---|---|---|
| Pixel 9 series | ✅ | All models |
| Pixel 8 series | ✅ | All models |
| Pixel 7 series | ✅ | All models |
| Pixel 6 series | ✅ | All models |
| Pixel 5 / 5a | ✅ | All models |
| Pixel 4 / 4a | ✅ | All models |
| Pixel 3 / 3a | ✅ | All models |
| Pixel 2 and earlier | ❌ | No eSIM support |
Other compatible devices
- OnePlus: OnePlus 11, 12, Open, Nord 4 (selected models)
- Xiaomi: Xiaomi 13, 14, Redmi Note 13 Pro (selected models)
- Motorola: Razr 40, Razr 50, Edge 40/50 Pro
- Nothing: Phone (2), Phone (2a)
The most common compatibility trap: carrier-locked phones
If your phone is locked to a specific carrier (common with phones bought on installment plans from AT&T, T-Mobile, Verizon, or carriers outside the US), it may not accept eSIM profiles from other providers. Contact your carrier to confirm whether your phone is unlocked before buying an eSIM. The unlocking process typically takes 24-72 hours — request it at least a week before your trip. If you’re unsure about the unlocking process, CNET’s guide to phone unlocking explains the rules and procedures for major carriers.
Choose and buy the right USA eSIM plan
Most providers offer plans ranging from 1GB to unlimited data. Here’s a quick guide based on trip length.
| Provider | Starting price | Best for | Network |
|---|---|---|---|
| Ubigi | $4 for 1GB | Best overall value | T-Mobile |
| Airalo | $4.50 for 1GB | Short trips, easy setup | T-Mobile + Verizon |
| Tello | $5 for 1GB | Need a US phone number | T-Mobile |
| Nomad | $5.50 for 1GB | Road trips, national parks | AT&T + Verizon |
| Holafly | $19.50 for 5 days | Unlimited data | AT&T |
| Roami | $4.50 for 1GB | Auto network switching | T-Mobile + AT&T |
Buying is simple: go to the provider’s website or app, select your plan, and pay. The QR code arrives by email within minutes. The USA eSIM price guide has a full breakdown of what each provider charges at every data tier.
USA eSIM install before departure checklist
Follow this USA eSIM install before departure checklist to avoid last-minute problems:
| Step | Task | Status |
|---|---|---|
| 1 | Check phone compatibility — Dial *#06# and confirm EID number appears |
☐ |
| 2 | Check carrier lock — Contact your carrier if unsure. Request unlock at least 1 week before trip | ☐ |
| 3 | Buy your eSIM plan — Choose provider and purchase online | ☐ |
| 4 | Save the QR code — Screenshot it and also save the manual activation code | ☐ |
| 5 | Install the eSIM profile — Scan QR code while on WiFi at home | ☐ |
| 6 | Label the line — Name it “USA Data” or similar for easy identification | ☐ |
| 7 | Configure dual SIM — Set data to eSIM, voice to home SIM | ☐ |
| 8 | Download offline maps — Google Maps offline for your destination cities | ☐ |
| 9 | Save provider support info — Contact details in case of issues | ☐ |
| 10 | Test with free trial — Roami’s free eSIM lets you practice the full process | ☐ |
Check each box before departure. This checklist covers every key step for installing USA eSIM before departure without stress.
Install the USA eSIM profile on your phone
This is the core USA eSIM QR code installation guide. Do this before you leave home, while connected to your home WiFi. The plan won’t start counting until you connect to a US network.
How do I install a USA eSIM on iPhone? (iOS 18)
- Open Settings → Cellular → Add eSIM
- Tap Use QR Code and scan the code from your email or provider app
- If scanning doesn’t work, tap Enter Details Manually and type the SM-DP+ address and activation code from your confirmation email
- Label the line something clear — “US Data” or “USA eSIM”
- Set your default voice line to your home SIM and your default data line to the new eSIM
- The profile installs automatically
How do I activate a USA eSIM on Android? (Samsung Galaxy)
- Open Settings → Connections → SIM Card Manager → Add eSIM
- Tap Scan QR Code and point your camera at the code
- Samsung phones may also offer a direct install option through the provider’s app
- Name the eSIM and set it as your preferred SIM for mobile data
How do I activate a USA eSIM on Android? (Google Pixel)
- Open Settings → Network & Internet → SIMs → Add eSIM
- Tap Download a SIM instead? or Scan QR Code
- Follow the on-screen prompts
Can I install USA eSIM without WiFi?
Can I install USA eSIM without WiFi? Yes, but you need an alternative internet connection:
| Method | How it works | Best for |
|---|---|---|
| Mobile hotspot | Use a friend’s phone as hotspot for the 2 minutes needed to scan the QR code | Traveling with others |
| Airport WiFi | Connect to free airport WiFi upon arrival and download the profile | Late deciders |
| Manual entry | Provider emails you the SM-DP+ address and activation code to type manually | All travelers |
| Provider app | Some apps (Ubigi, Roami) offer direct download without QR scanning | iPhone users |
If you don’t have WiFi at home, install at any free WiFi location before departure. The QR code is small — a screenshot of the code works if you can’t scan the original.
Can I install USA eSIM before my trip?
Can I install USA eSIM before my trip? Absolutely — and you should. Installing the eSIM profile before departure is the recommended approach. The plan won’t start counting until you connect to a US network, so there’s no downside to installing early. In fact, installing before your trip avoids potential connectivity issues at the airport and ensures you have service immediately upon arrival.
Step-by-step: Buy the plan, save the QR code, scan it while on WiFi at home, label the line, and you’re done. The profile sits dormant on your phone until you arrive and turn on data roaming.
Configure dual SIM settings
This is the part most people get wrong. The eSIM handles data — your home SIM handles calls and SMS. Here’s how to set that up.
On iPhone:
- Go to Settings → Cellular
- Under Default Voice Line, select your home SIM
- Under Cellular Data, select the USA eSIM
- Turn Data Roaming ON for the eSIM line (required for travel eSIMs)
- Turn Data Roaming OFF for your home SIM (prevents surprise charges)
Do I need to turn on data roaming for USA eSIM?
Do I need to turn on data roaming for USA eSIM? Yes — this is the single most important setting. Travel eSIMs require data roaming to function. Without it, your phone won’t route data through the eSIM. The setting is safe to enable because you’re using a local data plan, not your home carrier’s international roaming.
On Android (Samsung):
- Go to Settings → Connections → SIM Card Manager
- Set Mobile Data to the USA eSIM
- Set Calls and SMS to your home SIM
- Enable Data Roaming on the USA eSIM only
On Android (Google Pixel):
- Go to Settings → Network & Internet → SIMs
- Tap the USA eSIM and enable Data Roaming
- Make sure mobile data is set to the eSIM line
For a more detailed walkthrough with screenshots, the USA eSIM dual SIM setup guide has device-specific instructions for each phone model. If you’re looking for a provider that simplifies the network switching process, a USA eSIM with automatic carrier selection can handle this in the background for you.
How to set APN for USA eSIM manually
Most providers configure APN automatically. When they don’t, your data won’t work until APN is set correctly. Here’s how to set APN for USA eSIM manually:
| Provider | APN | Username | Password |
|---|---|---|---|
| Airalo | airalovpn |
(blank) | (blank) |
| Holafly | holafly |
(blank) | (blank) |
| Ubigi | auto-configured | — | — |
| Saily | auto-configured | — | — |
| Nomad | auto-configured | — | — |
| Roami | auto-configured | — | — |
| T-Mobile prepaid | fast.t-mobile.com |
(blank) | (blank) |
| AT&T prepaid | nextgenphone |
(blank) | (blank) |
| Verizon prepaid | vzwinternet |
(blank) | (blank) |
To set APN on iPhone: Settings → Cellular → Tap the USA eSIM line → Cellular Data Network → Enter the APN value.
To set APN on Android: Settings → Connections → Mobile Networks → Access Point Names → Add new APN.
After entering the APN, restart your phone. Data usually starts working within 30 seconds. If you’re still having issues, check the USA eSIM troubleshooting guide for advanced fixes. TechRadar’s eSIM troubleshooting guide also covers common APN issues across different devices.
Activate and test when you land
When your plane lands in the US:
- Turn off airplane mode
- Toggle airplane mode on and off — this forces a fresh network connection
- Open Safari or Chrome and load any page
- Try Google Maps — if the map loads, you’re connected
When should I activate my USA eSIM?
When should I activate my USA eSIM? Here’s the straightforward answer: Activate immediately upon landing in the US. You should install the eSIM profile before departure, but leave it toggled off until you arrive. Activating at the moment of landing maximizes your plan’s validity period.
If you’re arriving late at night (after 10 PM), consider whether you’ll use data before morning. Some plans use 24-hour activation cycles — activating at midnight means day 1 ends at midnight. For best value, activate in the morning after arrival. Most providers, including Airalo, Ubigi, and Roami, start the clock when you first connect to the network.
Airplane mode and domestic flights
Your eSIM won’t connect to cellular above 10,000 feet. If you buy airline WiFi, turn on airplane mode and connect to the WiFi as usual.
Activating your eSIM in different US time zones
Some eSIM plans use 24-hour activation cycles, meaning if you activate at 6 PM EST, your first “day” ends at midnight EST — only 6 hours of use. This matters if you arrive late in the day on the West Coast but your plan runs on East Coast time. To maximize value, activate your eSIM in the morning rather than late evening, regardless of when you land. Most providers use US time zones; check your plan terms to understand how days are counted.
Using your eSIM during domestic US flights
Most US airlines now offer onboard WiFi for purchase, but your eSIM won’t connect to cellular networks above 10,000 feet. If you buy the airline’s WiFi, turn on airplane mode and connect to the WiFi network as usual — your eSIM isn’t involved in this process. Some airlines like Delta and JetBlue offer free messaging via onboard WiFi. For browsing and streaming, paid WiFi plans range from $5-20 per flight depending on the airline and route.
What to do if your phone says “Carrier Locked” or “SIM Locked”
If your phone shows a carrier lock message when trying to install a USA eSIM, your phone is locked to a specific carrier. Contact your home carrier to request an unlock. Under FCC rules, most US carriers unlock phones on request if they’re paid off. For non-US carriers, unlocking policies vary. The unlocking process typically takes 24-72 hours after request. Request it at least a week before your trip.
How to top up USA eSIM data
If you run out of data during your trip, how to top up USA eSIM data depends on your provider:
| Provider | Top-up method | Minimum top-up | Can top up? |
|---|---|---|---|
| Ubigi | App → My Plans → Add Data | 1GB | ✅ |
| Airalo | App → My eSIMs → Add Data | 1GB | ✅ |
| Holafly | App → Extend Plan | 5 days | ✅ (extension only) |
| Nomad | App → Top Up | 1GB | ✅ |
| Tello | App → Manage Plan → Add Data | 1GB | ✅ |
| Roami | App → Add Data | 1GB | ✅ |
Step-by-step top-up process (most providers):
- Open the provider’s app
- Go to “My Plans” or “My eSIMs”
- Select your active plan
- Tap “Top Up” or “Add Data”
- Choose your additional data package
- Complete payment (credit card or PayPal)
- Data is added immediately — no new QR code needed
Important note: If your plan has expired, you may need to purchase a new plan rather than top up. Always check the validity period before topping up. Most providers allow top-ups only while the plan is still active.
Can I reinstall my USA eSIM if I delete it?
Can I reinstall my USA eSIM if I delete it? The short answer is: No, you cannot reinstall a deleted USA eSIM profile.
Once you delete an eSIM profile from your phone, the QR code is single-use and cannot be scanned again. The same QR code won’t work a second time. Here’s what to do:
| Provider | Can you reinstall? | What to do |
|---|---|---|
| Airalo | ❌ No | Contact support. May require purchasing a new plan |
| Ubigi | ❌ No | Contact support. May require purchasing a new plan |
| Holafly | ❌ No | Contact support. May require purchasing a new plan |
| Tello | ✅ Maybe | Contact support. Some cases allow re-download through the app |
| Nomad | ❌ No | Contact support |
| Roami | ✅ Maybe | Contact support. Account-linked profiles may be re-downloadable |
The best practice: Never delete your eSIM profile during troubleshooting. Only delete it when you’re certain you won’t need it again. Always save your QR code as a screenshot and store the manual activation code from your confirmation email — some providers can use these to reissue a working profile.
If you must delete: Contact support before deleting. Some providers can generate a new QR code if you still have your order number and activation details. The process may take 24-48 hours.
USA eSIM installation problems fix
USA eSIM installation problems fix — here’s how to resolve the most common issues:
| Problem | Likely cause | Quick fix |
|---|---|---|
| QR code won’t scan | Camera focus or lighting | Screenshot the QR code and scan from the screenshot |
| “No cellular data” after installation | Data roaming off | Turn on data roaming for the eSIM line |
| 5G showing but no internet | APN not set | Manually enter APN from the table above |
| Phone won’t accept the eSIM | Carrier locked | Contact carrier to unlock phone |
| “Unable to add eSIM” error | Incompatible device | Check EID number via *#06# |
| eSIM installed but no signal | No network selection | Manually select T-Mobile, AT&T, or Verizon |
| Data stopped working mid-trip | Plan expired or data used up | Check plan validity and remaining data; top up if needed |
For more detailed troubleshooting, Reddit’s r/eSIM community is a useful resource where travelers share real-world solutions to common installation problems.
Common mistakes to avoid
Not turning on data roaming. This is the single most common reason eSIMs don’t work after landing. Travel eSIMs require data roaming to function. Without it, your phone won’t route data through the eSIM.
Turning on the eSIM before arriving. Some plans start counting from activation rather than first network connection. If you enable the eSIM line at home, you could lose a day of service. Leave it toggled off until you land.
Deleting the profile during troubleshooting. QR codes are single-use. If you delete the eSIM profile, you cannot reinstall it with the same QR code. You’ll need to contact support for a replacement.
Not checking carrier lock. If your phone is locked to a carrier, USA eSIMs won’t work. Check with your carrier before buying.
Forgetting to turn off home SIM data roaming. Turn data roaming OFF on your home SIM to prevent international roaming charges.
USA eSIM installation frequently asked questions
How do I install a USA eSIM on iPhone?
Open Settings → Cellular → Add eSIM → Scan QR code → Label the line → Set data to eSIM, voice to home SIM. Complete installation before departure while on WiFi.
How do I activate a USA eSIM on Android?
For Samsung: Settings → Connections → SIM Card Manager → Add eSIM → Scan QR code. For Google Pixel: Settings → Network & Internet → SIMs → Add eSIM → Scan QR code.
Can I install USA eSIM before my trip?
Yes — and you should. Install the profile while on WiFi at home before departure. The plan won’t start counting until you connect to a US network. This is one of the key advantages of a USA eSIM over physical SIM cards — you can set everything up before you leave.
When should I activate my USA eSIM?
Activate upon landing in the US. Install the profile before departure but leave it toggled off until you arrive. For best value on 24-hour cycle plans, activate in the morning rather than late evening.
How to check if my phone supports eSIM for USA?
Dial *#06# on your phone. If you see an EID number listed alongside the IMEI, your phone supports eSIM. Most iPhones from XS onward (except China/HK/Macau), Samsung Galaxy S20 onward, and Google Pixel 3 onward support eSIM.
Can I install USA eSIM without WiFi before flight?
Yes. Use a friend’s phone as a hotspot, connect to airport WiFi, or use the manual entry option with the SM-DP+ address and activation code from your confirmation email.
Do I need to turn on data roaming for USA eSIM?
Yes. Travel eSIMs require data roaming to function. Turn data roaming ON for the eSIM line and OFF for your home SIM to prevent international charges.
Can I reinstall my USA eSIM if I delete it?
No. The QR code is single-use. If you delete the profile, you cannot reinstall it with the same QR code. Contact support — they may be able to generate a new profile. Best practice: never delete the profile during troubleshooting.
Roami’s USA eSIM switches between carriers automatically and offers live customer support if you run into installation issues. A free eSIM trial lets you practice the entire installation process before your trip. Code WEB20 takes 20% off any plan.
Prices change — verify current rates on each provider’s official website before purchasing. Last updated July 2026.
