Straight Talk sent the following via sms which I put in a new APN.
Name: ST APN
MMSC: http://mmsc.mobile.att.net
MMS Port: 80
MMS_APN_TYPE: default,mms,supl
If a setting was not directly mentioned in the text I left it blank except as below.
APN Protocol & APN Roam were left at the ATT setting...