Move your line to Sprint and get a $100 prepaid Mastercard per line ported after 60 days. Must buy phone outright. Valid until 4/4 http://sprintpromotionshub.com
Offer number 19-64522
Phone is $288 + tax
You can get this with the SWAC plan (Sprint friends & family) and service will be free for 1 year (when adding a line, even if it's your first) + $188 for an iPhone 7+ after $100 MC @ 60 days. You can unlock the phone after 50 days on Sprint.
Alternatively, the $25 Kickstart Unlimited plan is available on this phone, so you can get $25/month unlimited if you don't want to go through the hassle of finding a Sprint employee to "sponsor" you. If you go this route, Tob cb will give you $80 back if you click through their site to purchase the phone.. you could effectively cancel after the 3rd payment and you just got 3 months free service and a $188 7+