I have an issue with VM at the moment. I left Tmobile to go with VM and i wished that i had researched VM more before i signed the contract. I have found that when i have used my allowance the calls are very expensive. I dont know what they are compared to tmobile.
Also i have started a thread about another problem i have. This may not be a problem for you but it is obviously worth knowing everything so you can make an informed decision.
http://www.cableforum.co.uk/board/93...ts-at-2am.html
Good luck with whatever you decide to do.