It's pretty standard practice to first check the carrier's web site. I've seen the data settings in their tech support area.
Hello, i need information on how to get these setting, (listed in the subject) for an unlocked AT&T Samsung SGH-A867 that i want to use with T-Mobile
I need this information for Network Profile & MMS:
Thanks for ur help. If u want u can write me the info to firstname.lastname@example.org tks