Name: AT&T
APN: pta <------ exactly
mmsc: http://mmsc.mobile.att.net
mms proxy: proxy.mobile.att.net
apn type:
default,admin,fota,mms,supl,hipri,internet
Apn Roaming protocol: ipv4/ipv6
see screenshot of the speed test. slightly better than my *good luck part 1 thread...