They don’t care. Their job is solely to provide you with access to their cellular network. As long as you keep that tied to one device (and don’t phone clone, meaning share that access with multiple devices), they don’t care.
If you’re leasing your phone from them, then I guess they’d care but really only when they get the phone back. It would be best to put everything back to stock when that time comes. Of course this means you’ll want to take care to install only what you’re comfortable with and what you know works and won’t permanently damage the phone.
They don’t care. Their job is solely to provide you with access to their cellular network. As long as you keep that tied to one device (and don’t phone clone, meaning share that access with multiple devices), they don’t care.
If you’re leasing your phone from them, then I guess they’d care but really only when they get the phone back. It would be best to put everything back to stock when that time comes. Of course this means you’ll want to take care to install only what you’re comfortable with and what you know works and won’t permanently damage the phone.
Some carriers also lease your phone. This could be what OP is asking.
Oh that’s a good point, I see the concern there. Thanks for the clarification, I’m going to edit my comment with that part.