is boost gsm
---I don't want to buy a new phone when I switch from BoostMobile to StraightTalk. Any guidance is appreciated. --- 1 I am required to stay with BoostMobile for the next 7 months-because I need to use up a $228 credit (no refunds given). --- 2 Boost Mobile uses GSM network. --- 3 GSM network has poor coverage in my home.