My screen on my S21 isn't visible. Phone company sent me a new phone, and I already put the sim from the old phone in the new phone and transferred everything. Only problem is, I can't reset the old phone to factory before I send it back to phone company. Is it possible to do so with no sim and no visible screen? I just worry about all the saved pswds, docs, etc. Are things like that able to be accessed by the ppl at tmobile under these circumstances?