I was offered a Three Home Signal box free of charge when I phoned up to complain that I had woken up to find "No Signal" on Three. There was a fault on my local mast, which got fixed later that day.

No 4G by Three where I live, but I've got Sky Fibre (so don't use mobile data services at home) & the Home Signal covers voice/sms (providing broadband is up!)

Good 4G by Three coverage where I've been working this year though (all city centre locations) and I've got a Three mi-fi (3G) on a rolling 1 month (15 for 10GB) which works well when I'm away.

Local VF coverage is pants so I'll stick as I am for now.