I received the new purple sim, started using it, all seemed fine at first. Since the weekend I have not been able to send texts, they all come up saying 'Number not in use'. When I try to call someone, it diverts to calling the emergency services! I have received texts and calls just fine since then. The SMSC number on my phone is +447458399008 which should be the right one? No idea whats wrong, please help!