There's a GSM hardware switch - https://hackaday.io/project/19035/log/60071 https://hackaday.io/project/19035/log/60071 - so this is the way to go then, simple

There's a GSM hardware switch - https://hackaday.io/project/19035/log/60071 https://hackaday.io/project/19035/log/60071 - so this is the way to go then, simple as that =) So far, the software is going to assume that the modem is on at all times - however, I'll solve that in the next PCB revision.