Everything "web MMS" works on My S2 works only when i change the Authentication Type: to "PAP"
Internet:
Name: Straight Talk Internet
APN: att.mvno
Proxy: proxy.mvno.tracfone.com
Port: 80
User Name: Not Set
Password: Not Set
Server: Not Set
MMSC: Not Set
MMS Proxy: Not Set
MMS Port: Not Set...