How to Transfer Contacts From an AT&T SIM Card to T-Mobile


AT&T Wireless and T-Mobile USA are both major mobile providers in the U.S., but they aren’t necessarily compatible when it comes to address book transfer. Each company has an address book synchronizing program called Mobile Backup, but the two programs aren’t related to each other and can’t synchronize with each other. However, each program has an import/export feature that can create backup files to help the two programs work together.

  • Remove the battery cover and battery from your AT&T phone. Insert the AT&T Wireless SIM card in its SIM holder. Turn on your AT&T phone. Navigate to the address book application. Press the menu key and click “SIM phone book.” Press the menu key again and click “Copy to Phone.”

  • Launch the AT&T Mobile Backup application from your phone. Click “Backup” to begin synchronizing your phone’s contacts with the Mobile Backup Web interface.

  • Log in to your AT&T Wireless Mobile Backup account in your computer’s Web browser. Click “Export Contacts” from the AT&T Wireless Mobile Backup Web interface. Follow the screen prompts to create a backup file for your address book and save it on your computer’s hard drive.

  • Log in to your T-Mobile USA Mobile backup Account in your computer’s Web browser. Click “Import Contacts” from the home page. Follow the screen prompts to select the backup file you created in Step 3 and upload it to the Web interface.

  • Browse your T-Mobile USA handset to ensure that the SIM card contacts auto-synchronized with the handset's address book.

Tips & Warnings

  • There may be duplicate entries. Browse your T-Mobile USA handset and manually remove duplicates.
  • Both AT&T Wireless and T-Mobile USA make and sell several hundred mobile handsets, each with its own interface. If you have any trouble completing this process, consult your user guide or contact customer service.

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  • Photo Credit sim card image by Renato Francia from
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