Hi Got a HTC one x plus 32 gg versioni, was brand new sealed andon o2...been working fine for a,few months, but noticed that in the,Last few Weeks or so..i c ant dial out or,recieve incoming calls.... i can dial a number, but after About 7 secs... i get network busy error message then nothing, This is happening more and more , i can get the phone to work normally by rrmoving the sim and putting it back in....Will work for a few calls then it will stop working again..its not the network as it works fine in anothetr phone...havnt tried factory reset yet....any ideas?