bazzer:
Isn't it *100#1#? Or does *100*1# work too? I love *100#1# btw! :)
Weeeell, the 3GPP Technical Specification says, in a nutshell, that the digits in the middle of the string must be "*". It just so happens that our USSD gateway, and most handsets, also cope with "#" in the middle.
So - *100*1# is compliant with 3GPP TS22.030 and TS22.090, but *100#1# mostly works anyway. They both do the exact same thing.