INVENTIA MT-301 - Unblocking of SIM Card

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Their functions are:
GSM LED - reflects current login to GSM network state.
 Lit - the module not logged in
 Flashing with app. 2 Hz frequency - the module is logged in
STATUS
Diode informing about working mode of GSM/GPRS modem
 Off – initialization of modem
 Lit – wrong PIN number
 One flash every two seconds (0,5Hz) – GSM mode,
 Two flashes every two seconds (0,5Hz) – GPRS mode,
 Three flashes every two seconds (0,5Hz) – PPP connection error, wrong APN name,
user name or password
 Flashing evenly – no SIM card
RS-232
Diode signaling RS-232 port state:
 Flashes with high frequency (5Hz) - initialization of internal program and parameters.
In this mode modem accepts AT commands, what allows firmware change.
 One flash every 2 seconds (0,5Hz) – RS-232 port is ready to service MTManager.
 During communication with MTManager diode turns on for 0,2s after receiving each
sign.
8.2. Unblocking of SIM card
Three failed attempts of entering PIN code locks the SIM card and requires entering the PUK
code. In order to prevent this, the module controls the number of failed attempts written
into SIM card by allowing only two attempts making a third attempt impossible even if the
third attempt was correct.
A double unsuccessful attempt is perceived as a fault requiring user intervention. An
attempt to unlock the module may be performed only when the right PIN code is known.
Necessary procedure:
 turn the power supply off
 remove SIM card from the module
 insert SIM to ordinary mobile phone accepting cards from the operator that issued
actual SIM
 start the phone and enter proper PIN code
 if not accomplished before...
- start the module
- insert appropriate PIN into configuration
- power the module off
 remove the SIM from the phone and place it in the module
 start the module
The described procedure reset SIM card's fault counter and allow using the card in
MT-301/302/303/304 module.