if you receive a code with 16 digts and it does not work cut the half of the digits until get 8 codes and the another 8 codes try the 8 digits codes
Example
your code 01234567891011121 separe 012345678 & 91011121 and this will work
IF your code is not found use Mexico ( at&t / Iusacell / Unefone / Nextel ) Generic Codes Data Base 2