$140 per month? Absolutely ridiculous. I pay $58 per month for unlimited everything plus all the frills on T-Mobile. If they have good coverage in your area, I advise you to look at them or one of their MVNOs first.
Sprint has some plans as well if you live in an area where their network isn’t congested. I was on Virgin Mobile when I first switched over to a smartphone.
Verizon and AT&T are two sides of the same coin: like Republican and Democrat.
T-Mobile and the MVNO’s look great. My only concern about the MVNO is their coverage. I do not want a wireless phone that only works in a few areas. It kind of defeats the entire purpose of it.
My Boost service (unlimited everything) is $40/month on my Samsung S5. Since Boost uses Sprint's network, coverage if good.