Please can anyone help. I have a Pyronix Euro 46 Alarm with a gprs + sim module. After the free year of the Home Controll app, I changed the communication setting to just sms signalling. Everything was working fine until about 3 weeks ago. I was getting a test text every week. That stopped and I would get a fault "control panel arc call fail." I have not done any arc setting, it shows format not used. I have a giffgaff sim. If I put the panel into engineering mode I get a text to say so and when I exit. So the sim is working. Any suggestions please.