I live in Dorset and mobile reception in some parts of the county is pretty
ropey to say the least. In any location, however, some networks are better
than others - but overall no single network is perfect.

My question is therefore is it possible to get a SIM card or whatever in the
UK which enables one to 'roam' i.e. automatically switch between the
networks and take the strongest signal. This is what appears to happen when
one is abroad.

Any suggestions please - especially if they don't cost the earth?!

TIA

V