One USA +1 line, working at home in the States and roaming abroad.
At home in the USA your StateLine line works like a normal US mobile line — calls, texts and data on its network, with your real +1 number.
Outside the USA the line roams on local partner networks in many countries around the world — including Nigeria, where it connected on Nigerian partner networks in our own tests. Texts and data roamed with it and run from the same plan basket you bought.
Roaming quality follows the local partner network — strong in cities, thinner in remote areas, like any roaming line. Your basket (data, texts, minutes) is shared wherever you use the line; when part of it runs out, that part stops until you top up. Calls connect inside the USA — in our own tests from Nigeria, texts and data worked and calls did not, so abroad, count on texts and data.
Email us before you buy and tell us the country — we'll tell you straight whether the line roams there, rather than sell you a plan and hope.