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3 share EE's network so their coverage should be the same. Either way if allowance is an issue, T-Mobile's mobile broadband is unlimited. Useful if you're without internet for prolonged periods.

I don't see any reason they would refuse to let you move your old service though. But if you sign up new with VM you get their money back guarantee but I recall something about you cannot sign up at the same address after you disconnect for 6 months (under the same name)