I have two questions about the Thunderbolt:
1) Does it allow you to have different ring tones for contacts when they send a text messages?
2) Does it show delivery conformation?
1) I'm not sure about different sounds for different text messages, but I don't believe so.
2) You can set it to give you a delivery confirmation. The problem though (for me at least) is that it notifies
you each time it confirms it was delivered. I found myself constantly checking to find out if the notification
was a new text message or the confirmation. VERY annoying! I had to turn off confirmations.