I searched google for the settings and found this for AT&T LTE
Name: ATT PTA
MMS Proxy: proxy.mobile.att.net
MMS port: 80
APN type: default,mms,supl,hipri
These are the settings I had before, but do not seem to be working
They work for 30 seconds, but then die out, same as toggling airplane mode or rebooting.
thanks for the quick reply