Don’t need to be a T-Mobile customer and can renew when your 5GB is up. I have an ATT pre-paid unlimited plan that i use normally but i add this plan as a supplemental plan always active for when i go to places that are really bad ATT service, like Atlanta, and i switch it over to use ... if i use it up i load up another $10 worth ...which lasts another 5 months ... lightning fast and convenient when you need it and your only out $10 ... if you don’t use a lot of data, you only need the T-Mobile plan, sign up right on your iPad, it works with the e-sim and can be loaded along with any other plans you may have ON THE SAME E-SIM... i travel a lot and WiFi not always convenient ... so i make use of all my plans, but for those that have a lot of WiFi available, then this is the only plan you need ... best plan available period.