For as long as I remember, I've had awful mobile phone signal in my house and it's been quite annoying, but today I think I figured out why, although it's not a great discovery...
Basically, I was in the loft and I accidentally knocked my phone out of my pocket. Upon picking it up I realised the signal was lower than normal, at completely nil for all networks (it has been known to say "limited service" and have some signal, I suspect it's because you can make an emergency call through any network, but nothing else make any difference). I then held it up to the velux window and noticed a heavy signal increase to four out of five bars, I moved it back into the main body of the loft and it dropped fully again, I repeated this a few times, with conclusive results:
The insulation in our loft attenuates mobile phone signals!
The reason for this deduction is because it's foil insulation (weird stuff, it's like metal bubblewrap, it's really good though, and very easy to put in, me and my mum put it up ourselves) so I assume it's making some sort of cage which catches the signals, or at least lowers them to almost naught
This really doesn't help, but at least I know why the signal is so awful now!
Anyway, can anyone suggest a way to alleviate this problem short of placing an antenna on the roof and running a looong cable to plug into the phone? There must be a way to negate the effect this "cage" is having on my signal!