I have been able to send messages with a gsm module, but now it will not registrate on the network. I send AT commands and when it responds OK when I plot the PIN code. But when i write at+creg? it aswers 0,0. Which means that it is not registred at the network. This have not been a porblem before. Can it be the antenna not working?
cannot be the antenna.
what about the module? if it has gone bad?
tried these. Testing the SIM card with a different module if you have or using a different SIM in this module.