What is a carrier-locked phone?
A carrier-locked phone only works with the mobile provider it was originally sold through. That means if your phone was purchased through a specific carrier (like AT&T, Verizon, or T-Mobile), it may be restricted from working with other SIM cards — including Firsty eSIMs.
These restrictions are sometimes temporary (until the device is paid off), and they can usually be lifted.
How to check if your phone is locked
Let’s walk through how to check if your phone is carrier-locked.
iPhone
Open Settings
Tap General > About
Scroll down to Carrier Lock
If you see “No SIM restrictions”, your phone is unlocked
If you see anything else, it may be locked to a specific carrier
Android
Android phones can vary, but here are two common ways to check:
Option 1: Use a different SIM
Insert a SIM from another carrier
Restart your phone
If you see a message like “SIM not supported” or “Network unlock code required”, your phone is likely locked
Option 2: Check in settings
Go to Settings > Connections > Mobile Networks > Network Operators
If you can’t search or choose other carriers, that may indicate a lock
What to do if your phone is locked
If your phone is locked, don’t worry — you still have options.
1. Contact your original carrier
Reach out to the mobile provider the phone was originally sold through. Ask them to unlock it. Most carriers will do this if:
The phone has been fully paid off
It’s been active on their network for a certain period (e.g. 60–90 days)
You’re the original owner
You’ll either receive:
A network unlock code (for Android), or
An automatic unlock pushed to your phone (for iPhone)
2. Still unsure who locked it?
Try checking your phone’s boot-up screen for logos (e.g., T-Mobile, AT&T)
Look for pre-installed carrier apps
Search your phone model + “carrier locked” online
Use a free IMEI checker (like imei.info) to learn more about the device’s lock status