Public:Field Test Mode

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Manufacturer Mobile Phone Code Firmware Comment
Apple iPhone *3001#12345#* iPhone OS 4.0
Samsung Galaxy S3 *#197328640# Android 4.1.2 Choose in MAIN MENU

[1] DEBUG SCREEN and then [1] BASIC INFORMATION

HTC Android devices *#*#4636#*#*
Some Samsung, Motorola and Sony Ericsson Android devices *#*#4636#*#* Works not with Samsung Galaxy S3 Android 4.1.2
ZTE Android devices *983*3640#

Here you can find another great site with field test codes: