Nokia 3110 Tips:

*#06# for checking the IMEI
It Means International Mobile Equipment Identity

*#7780# restores Factory Settings..(Memory, language, counters not included)

*#3110# for checking the phone's software (SW) - called firmware revision information.

#746025625# [*#sim0clock#]
Checks if the sim clock can be stopped. Sim clock stop is a kind of stand-by mode which will save battery time. This code doesn't work with software version 4.59.

*#92702689# [*#war0anty#]
Press the following warranty code: