*#06#=timeout modem didnt reply at 30, 15, 40, 50, 60 (code for imei)
*135#: it works (code for asking own phone number)
*221#=timeout modem didnt reply at 30, 60 (code for changing sim card)
*#43#=timeout modem didnt reply
*#33#=could not init modem
*#61#=timeout modem didnt reply
*#2820#=timeout modem didnt reply at 60 (code for asking bt address)