You can see by the age of this post that the chance of a large area improvement is a long time coming.
It's a question none of us can answer, I'm afraid.
As with all networks best to try them out with a PAYG SIM first and choose the one that gives the best reception for you. Also things can change quickly at the moment so don't tie in to long term contracts
This is not O2 and we are all customers here similar to yourself and cannot answer account type queries.
