Hi, have problems with GPRS shield? well, don't worry, you just one of people who have confronted this kind of problem and you can learn more about it and solve the problem easily after you have read: GPRS/GSM Shield v1.0 - Elecrow
i am also using the GSM shield v2 with arduino mega for a gprs based sensor monitoring . i am posting the values to a private server. my problem is the gsm shield gets freezed after sometime and i have switch off the shield and then restart again, what will be the problem??