I'm using an Xperia S LT26i and the signal keeps dropping. I used this phone before I had a Z. The Z has gone so I'm back using my old phone. I thought the old SIM had perished and that was why the signal was dropping out constantly, ie games kept throwing me out & back to home screen, FB said I had no connection/service despite icons saying I had full service & signal. Web pages were hanging or timed out constantly too as if I had poor or no signal even though the bars show full strength signal. I'm on T/Mobile/ EE and have been for last 3 phones, never had signal issues before. I've put a brand new SIM, which works in another phone, but its still dropping. So, its def the handset. I don't really want to wipe the phone as other users with same issue have said it doesn't work! Any suggestions or is it Sony Centre time? Thanks
Wiping the phone isn't going to fix a hardware issue, and that's what this sounds like. You can either contact Sony for assistance (possible repairs, maybe an exchange?) or get a new phone. Not much else you can do unfortunately.