So I recently got an upgrade for my S4 to an s6 while I was on a pay monthly contract, I take the phone out and insert the sim it came with but all I get is nit registered on network so I go to my settings,click onto networks and it loads up O2-UK. Clicked on that an all I get is that I cannot connect to that either. I also cannot use mobile data.
Was there any point in this new sim or should I swap my old one in?
