at+cpin?               -> PIN status
at+cpin=PIN            -> set PIN
at^cpic                -> PIN countert

at+clck="SC",2         -> PIN request status
at+clck="SC",0,"PIN"   -> do not request PIN
at+clck="SC",1,"PIN"   -> do request PIN

at+cops?               -> current operator
at+cops=?              -> avaiable operators

at+cpas                -> status (0 - ready, 3 - incoming, 4 - outgoing)

at+csq                 -> signal level

at^moni                -> network monitor [=sec]
at^monp                -> monitor neighbour cells [=sec]