Hi Cedric, On 09/17/2012 12:49 PM, Cedric Jehasse wrote: > Hi Denis, > >> To me it sounds like the output should be BASE followed by the inverted '!' >> sign. Unfortunately the modem is sending ISO-8859-1 characters instead of >> GSM like it is being told to do by the driver. That particular character is >> not valid utf8, hence we go kaboom. >> >> Having said that, I'm not familiar with 'BASE', does the above sound >> reasonable? > > The operator's name is just "BASE", so i wouldn't see why there would > be an inverted '!' sign. In some AT logs i've also seen "BASE0" as a > response to AT+COPS?, so i'm thinking this last character is just > garbage. What devices have you tried? It may be the character is garbage, but it might also be it is not. From the AT log the character you're getting is inverted exclamation point in Latin1 and it is a valid character in GSM character set... Regards, -Denis