HI alan
All i can say is that the voice signal they have now is 99% backed up by o2 if 3 cant supply a signal, 3g coverage is up and over 86% i belive the next best to that is vodaphone on 56%.
Also bert, sless, and my self also my mum, brother and friends are with 3 and have no problems aswell. there was a known issue with some lg phones a while back and that was to do with the phone rather than the network and lg held their hands up with that one!
If you pm me your postcode i can have a look at work!
And dont forget they offer a 14 day MBG!
Happy to help
claire x