iPhone Field Test Mode

iPhone can open a Field Test app. When in Field Test Mode, the device provides a lot of information not otherwise shown. For example, the IP address (no, not the one for Wi-Fi) can be located, neighboring cells can be shown, etc. To open the Field Test app, tapĀ *3001#12345#* and then tap the Call button.

 

  • Cyrus

    Is this AT&T specific? Doesn’t seem to work on an unlocked iPhone using T-Mobile.

  • Adam

    Works on unlocked iPhone 4 (Australia, Telstra GSM) but not much meaningful information is displayed – a lot of ‘0’ and “unknown” results.