Sunday, January 29, 2012

How to Use iPhone 4S on T-Mobile or Simple Mobile

T-Mobile iPhone 4S
The iPhone 4S might not be offered officially for T-Mobile use, but if you buy an unlocked device and set it up properly, you can use the iPhone 4S and Siri on the T-Mobile network without incident. In fact, over a million iPhones are already on the T-Mobile network, and the company is going to actively support unlocked iPhone devices on their USA network due to immense demand. If you want to use an iPhone 4S on T-Mobile, here is everything necessary to do that.
  • 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.
  1. Turn the iPhone off
  2. Remove the default micro-sim card
  3. Insert the T-Mobile micro-SIM
  4. Turn the iPhone on with the T-Mobile sim inserted, ignore anything on the phone for now
  5. Connect the iPhone 4S by USB cable to a computer
  6. Launch iTunes
  7. iTunes will find the iPhone 4S and notify you the device is unlocked
Unlocked iPhone 4S Message in iTunes

Get your Unlocked iPhone 4 here

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:
  • APN: Username: Leave Blank Password: Leave Blank
  • Set the following configuration under MMS:
  • APN: Username: Leave Blank Password: Leave Blank MMSC: MMS Proxy: MMS Max Message Size: 1048576 MMS UA Prof URL:
  • 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. 
Jan 28, 2012


  1. I too used my T-mobile SIM card on an iPhone by unlocking it. I unlocked the iPhone using remote unlocking service. I got the remote unlocking service for an iPhone from This method of unlocking was safe, simple, affordable, quick and permanent. It didn't require a jailbreak too.