In case anyone has the same problems, the following settings worked for me, although I have yet to get LTE coverage
Field Smartphone Settings
Name straight talk
APN wap.tracfone
Proxy leave blank
Port 8080
MMSC h**p://mms.tracfone.com (Note replace ** with tt)
MMS Proxy leave blank
MMS Port leave blank
Just move to Cricket. I used to have ATT straight talk and had problems with mms on both Android and ios. With ATT Cricket, I never experience any problems. Even my step dad had problems with straight talk and his Android phone. I found out from other straight talk users that straight talk had some sore of problems and they experienced the same stuff. A few night a week, the service used to stop after midnight and texts sometimes didn't get delivered.
Posted via the Android Central App on Moto X 2014/Moto G3/Moto G1/Lenovo Tab S8/ Lenovo Yoga 11 on $35 Cricket wireless plan.