Motorola RAZR - v3

Internet Settings:
Select Main Menu > Settings > Web Access > Web Sessions > New Entry.
Enter the following information:
→ Name: good2go web
→ Homepage: http://ztdevice.home
→ Proxy 1: proxy.mvno.att.ztarmobile.com
→ Port 1: 80
→ Domain 1: Leave blank
→ DNS1: Leave blank
→ DNS2: Leave blank
→ GPRS APN: att.mvno
→ Username: Leave blank
→ Password: Leave blank
Select Done.
Highlight good2go web, select Options > Set as Default.

MMS Settings:
Select Main Menu > Messaging > Options > Setup > Message Setup > Multimedia Message Setup > Server Info. > Options > New.
Enter the following information:
→ Service Name: good2go web
→ Server address: proxy.mvno.att.ztarmobile.com
→ Web Session Name: select good2go web
Select Done > good2go web ,  and there will be a check next to it that indicates it will be using that mms profile.