Requirements:
Unlocked iPhone 4S bought from an Apple Store without a contract, intended for AT&T use
- A computer with iTunes
- Wi-Fi with internet access
- The original AT&T micro-SIM that came with the iPhone 4S
- An activate T-Mobile Micro-SIM card
Assuming the requirements are met, read on to get started.
Activate the iPhone 4S for T-Mobile
The first set of things to do involves activating the phone, if you’ve done this before on another network it’s no different here.
- Turn the iPhone off
- Remove the default micro-sim card
- Insert the T-Mobile micro-SIM
- Turn the iPhone on with the T-Mobile sim inserted, ignore anything on the phone for now
- Connect the iPhone 4S by USB cable to a computer
- Launch iTunes
- iTunes will find the iPhone 4S and notify you the device is unlocked
Congratulations, your iPhone has been unlocked
Now that the iPhone 4S is unlocked, you will be able to make calls but you need to do a few more things to get full functionality.
Setting Up the iPhone 4S for T-Mobile
After the device has been activated on the T-Mobile network, you’ll be able to make calls but you may need to perform the following to get data and MMS working on the device itself, this isn’t always necessary so presumably it depends on the precise T-Mobile network:
Before beginning, disable Wi-Fi by tapping to Settings > General > Network > Wi-Fi > OFF
- On the iPhone 4S, tap on “Settings” , then tap on “General” and then “Network”
- Tap on “Cellular Data Network”
- Set the following configuration:
- Set the following configuration under MMS:
- Tap on the Home button to save and exit out of Settings
- Reboot the iPhone 4S
- Launch Safari to test internet connectivity
Generally you’ll end up with EDGE for internet connectivity, but some areas including parts of Alabama, Georgia, Nevada, California, Oregon, and Washington actually have full 3G access. For now the 3G accessibility is hit and miss, but T-Mobile is apparently slowly expanding their network to be compatible.
Here’s a video of an iPhone 4S on T-Mobile’s EDGE network using Siri:
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