Hi! I am thinking of switching cellular networks to t-mobile and bringing on to my plan someone with a profound hearing loss who is planning to get the new Oticon Xceed hearing aid. She would probably get the iPhone 8 Plus or the iPhone XR. Before I make this decision, is there any difference between Verizon, T-Mobile or AT&T in terms of the clarity/quality of the sound? I’ve checked coverage. I just don’t know if there’s anything else to consider for someone with hearing loss before making this decision.