I have an iPhone 12 with only data on it because I have a really old t-mobile plan I dont want to change. I may add the Max and mini on my plan as data only or just the Max and pay full price for the mini to be used on Verizon. I'll look up my plan if that helps. Is this a good idea or will t-mobile allow me to add them as the regular way. I should have asked the guy but will reach out to them.asap. thanks