This plan does not work with the "Pay by the day" plans. You will need to be on a no-contract "Simple Choice" plan that gets you unlimited talk, text, and data within the USA starting at $50/ month for one line, (or $80 for 2, $90 for 3, $100 for 4 or $110 for 5 lines) then you also get the global services included for free.

T-Mobile has spent billions expanding the network - if you used to have issues with coverage where you live, that may no longer be the case. You can enter an address here to see what coverage is like at any address in the USA: http://www.t-mobile.com/coverage.html