Over the years I've been with O2(genie!), Vodafone, orange, EE, giffgaff then Three.

I am very impressed with Three. I've done a lot of miles over the years and being able to make a call while in a Train or using handsfree is quite important to me as it can be the difference between business gained or lost. Three has excelled in this area up in the northwest for me(my main stomping ground) on the major tranpost routes and only dropping out wheee you would expect it in the middle of nowhere lakes or Wales which is common across the other networks anyway but what you don't expect is blank spots along motorways. The M62/M6/M56 junctions are shocking for it, if I drove from Liverpool to stockport for example on the above route with O2/voda/EE signal would get patchy coming off the 62-6 and then from the m6-56 would drop out entirely for 20secs killing the call. Different phones made no difference of vehicles either.

The same along the M6 north, past Preston it would be really dodgey upto near Lancaster then drop out totally till you got to tebay. With three I'm getting 4G all over the place now and even when 4G isn't there it drops to 3G and worst case is 2G butninstill get the coverage and data isn't much use when driving anyway unless your using nav on the phone  FFRR MY06 facelift With TDV8 Alloys Zeros/ATR's
Mantec Sump Guard, Rigid Load liner, MY10 BT upgrade.

Nav on the phone You live on the wild side buddy

Was told that this is the quickest way to use all your data and then some They rather keep quiet about that, as they'd prefer to send you a whopping big bill at the end of the month..... I only use that feature in an emergency when Tomtom has naffed up, so every other day then

But in all honesty I only use it for the last few yards, and only once Tomtom has proved it's stupid and it hasn't got a clue where it is  Yesterday I couldn't spell Engineer... Today I are one!
Inventor of the 'Guide-o-Matic automatic wheel alignment tool'
Former long term L322 owner, Up/Down graded to a Classic Tractor!

I have unlimited data with no cap or throttling so I'm fine on that front most I've used was 25gig when I was in hospital for a week! FFRR MY06 facelift With TDV8 Alloys Zeros/ATR's
Mantec Sump Guard, Rigid Load liner, MY10 BT upgrade.