Also check out Cricket wireless, Cricket owned by ATT so you have their network all the time. We have been using it for a few years now, basic plan = unlimited everything, prices include ALL taxes and fees.
Get up to 5 lines $100 a month, total cost, 4 lines $100 (correct, get 4 lines and 5th is free) we have 3 lines = $90 a month ACTUAL payment
FYI, I also have a work supplied Verizon phone and can say, the Cricket works everyplace any other ATT phone and Verizon phone works/