we use straight talk...android smart phone ...from Walmart...we chose the specific phone that connects thru Verizon towers...3g is fine for us..but they do carry a 4g...we get unlimited phone & internet..$45/mo....
we're out in the boonies with it now...on mobile data...it can also connect thru wifi...but we've never needed to...
we have had no problems.....but since you asked about the booster...there's several free apps thru google play..but you need a good connection speed to download...but actually..I've found...they can't get no more than you got...
sorta like that "blood out of a turnip thing"
good searching & happy travels..we will be at Suwannee state park nxt winter/first time volunteering...we won know til we get there where the towers are