I've got an S3 and it won't receive any phone calls or texts at all. It was on O2 but I got it unlocked. I don't know why it's doing this.I've been trying to create a WhatsApp and Viber account but it won't verify the number and won't receive a text. People have been calling me on my number and it will say that number is available or not recognised etc... I've put the sim in my sister's s3 and it works perfectly in hers. I'm really scared and need a solution from anyone please. :'( Please help me and my phone