STRAIGHT TALK SIM APN SETTINGS (AT&T BASED, NOT T-Mobile)
I know this thread is old as hell, but to new users who are considering going with Straight Talk (ST), I suggest you do it. Its way cheaper than AT&T and you still get their coverage and not to mention unlimited data**. You can get the Straight Talk SIM card via their Bring Your Own Phone (BYOP) program. You can get it at their website.
**You get unlimited data as long as you don't abuse your data connection.
Oh and if you are having trouble trying to get data/mms working on your cappy with ST, here are the APN settings.
1. Download APN Back up/ restore from the Play Store
Name: ST (or whatever you want)
Username: Not set
Password: Not set
Server: Not set
MMSC: http:// mmsc. cingular. com (no spaces)
MMSC proxy: 126.96.36.199
MMS port: 80
Authentication Type: Not set
APN type: default,supl,mms
APN protocol: IPv4
Bearer: Not specified
I use this with Froyo, Gingerbread, and ICS. It works perfectly!
Cheers and let me know if this helps you out.
Not sure if this is still valid because I've changed carriers to Sprint. But I do know that Straight Talk has stopped the BYOP program.