I use a S7 as my main phone. I wanted to activate an old S4 (currently just a wifi device as no service) for the purpose of porting over my 25yo home phone number, to get it to google voice eventually (i.e., phase out my landline but keep the number; sentimental)
My S7 is Verizon; my home phone is AT&T.
What SIM would I buy? I assume I need a temporary new cell # for the S4 with activation, before porting over the home phone #, right?
Is it better to just buy a burner phone to do this ($20 phone, $25 prepay card)? I do not want to mess up my S7.