GPRS shield V2 IO voltages

Can anyone confirm the IO voltages on the GPRS shield? I doubt that that SIMCOM900 is producing 5V output levels at but I’d rather not risk my 3.3V due finding out. I guess its possible there is a level shifter but I havent found a schematic of the board to browse yet. I’m on a budget and got the shield from a friend for cheap. I didnt think about the volage issue until afterwards. I have a project where it would be really handy to have the shield on-board but I’d rather not but another arduino if I can help it.


You can provide 5 volt regulated and connect to your gprs. It’s working properly. Also you can provide 3.3 volt for other parts. But the main part can work with 5v