Mobile

Test Your iPhone 4′s Reception With Field-Test Mode In iOS 4.1

8:38AM September 9, 2010 | Jesus Diaz

Now you can put your iPhone in field-test mode, which will allow you to easily test your signal strength. You just need to follow these steps:

1. Upgrade your iPhone 4 – or any iPhone – to iOS 4.1
2. Dial *3001#12345#* into your phone

Done. The signal bars will be replaced with a number (like -85). The higher the number it is, the worse the signal it is. To get out of it, hit the home button.

Comments

  • woodsdog

    September 9, 2010 at 10:59 AM

    Mine does that for wifi for some reason… Ever since I upgraded to iPhone 4, it shows wifi in numbers? dont know why, but it is…

  • Ben H

    September 9, 2010 at 1:27 PM

    For the jailbroken on earlier iOSes, this feature is available in SBSettings for both GSM and WiFi.

    Measured in -dB, I think? So the further below 0 it is, the worse the signal. Correct me if I’m wrong!

  • trk

    September 9, 2010 at 6:43 PM

    For Android owners, this is available by going to Settings / About / Status.

    AFAIK its the same on all Android versions, 1.5 – 2.2

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