I am currently using an iPhone 5 with Verizon on a multi phone plan. Someone else on the plan wants to try T-Mobile, who are trying to undercut Verizon. I've had no problems with Verizon and I'm not a heavy user. I have no experience with, nor knowledge of, T-Mobile. I'm wondering if I should go with the flow or stick with Verizon. Does anyone have experience with both? Is T-Mobile's coverage as good ad Verizon's?