It is dificullt to tell what it could be, maybe the radio reception is bad or the antenna.
Did you try a SIM card from another provider and changed the position of the SMS module?
Type: Posts; User: Artur
It is dificullt to tell what it could be, maybe...
It is dificullt to tell what it could be, maybe the radio reception is bad or the antenna.
Did you try a SIM card from another provider and changed the position of the SMS module?
GSM (red) – shows the state of the GSM module:
...
GSM (red) – shows the state of the GSM module:
Fast flashing (1s-period): Is searching for a radio network, not registered on the net yet
Slow flashing (3s-period): Is registered in the radio...