I can't receive SMS text messages, but I can send after i connect to the internet, and use this software:
http://i330.nopdesign.com -- click on the apps page. Yes, it says i330 & i500, but it works great for sending!

You can thank user scm6079 for the above program!

And someone (not me) is currently working on getting inbound SMS and Voicemail notification to properly work, without connecting to the internet. I'm sure he'll post it here when he's done.

Also, I'm selling my SPH-i300 PDA phone, for those of you interested:

http://www.pdaphonehome.com/forums/s...threadid=42015

SiMpLe