After being with O2 for ages,giffgaff seemed a good idea as it runs on the same system. I've had my sim card a week now and can't send or receive calls. My phone starts off as if its going to ring but nothing happens. The data comes and goes too and as I need my phone for work 24/7 I'm not a happy bunny. I can't seem to get hold of anyone to help either. What do I do????
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