Yeah, I tested your code and it works - however I dont get all the sms I sent to the shield. Don't they show up because the puffer is read only 140 positions?
I can test the funcions with 1 pin aswell, so I won't get myself a mega for now. But thanks for the information!
Yeah, I am dissapointed aswell, I wouldn't get one of those shields again.
Thank you for your help!
Edit: Yeah, expand the puffer, get more messages shown. Thank you again for your advice!