(GSM) Service Codes

I keep forgetting these, so here’s a list.

Plus there are some day-to-day ones (not all of these are GSM related, some are hard-coded key sequences manufacturers build in):

Code Applies To Function Notes
*#21# Any Queries forwarding status These are GSM network inquiry codes
*#30# Any Calling Line Presentation status
*3001#12345# iPhone, Nokia, a few others Enter field mode
*#06# All Display IMEI
#67#number#11# Network Call forward on busy Voicemail prefix for VF-PT is 661
##67# Network Remove call forward on busy
*#06# All Display IMEI Some Motorola phones tend to crash on this one.
*#0000# Nokia Display firmware version
*#2820# Nokia Display Bluetooth MAC address
*#7780# Nokia Restore factory settings and preserve user data
*#7370# Nokia Deep format/Restore factory settings
*#war0anty# Nokia Warranty Dates Display extra info like build and repaired date
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SonyEricsson Service Menus Preserved since T68 and expanded in 2007 SEMC platforms