Hi, I've done a sim swop. Turns out the old sim card was damaged. The new one works fine now. Customer service was good at the 8ta store also, was sorted out within 15 mins.
A U SIM has more memory than a SIM for a phone. Check you were given the correct one. Although all should work, maybe you were given an old one. Verify the SIM number with 8ta and ask them what it is registered as