I have a T-Mobile ONE plan which is $70, but I've found that the hotspot feature is throttled to "512kbps" although my tests say it is far slower. I temporarily got the $10 add-on to increase my hotspot speed and it was really nice and fast, but I was paying $80/month so I cancelled the add-on and I am back at $70/mo. and now hotspot is extremely slow. Sometimes emails don't send or pages don't load. I don't use hotspot extensively, but when I use it I want it to work. Now, I am looking at Simple Mobile which for $60 gives me unlimited everything plus 10GB of LTE speeds on the hotspot and unlimited LTE data on the phone. I checked their coverage and it is basically the same as T-Mobile's since they use the same network, except that it looks like T-Mobile can roam in more places when traveling. The other thing is that T-Mobile has visual voicemail on the iPhone whereas Simple Mobile does not. Those two things are not a big deal to me. I can't think of any other differences. So, aside from that, can anyone tell me why I shouldn't switch to Simple Mobile, and pay $10 less than I pay now and get LTE speed hotspot, whereas with T-Mobile I have to pay more and get a very slow hotspot?