Originally Posted by JSanders
Yes, some instant message programs are data-based rather than SMS-based. JiveTalk is a good example of a data-based chat program.
You will need the Blackberry Unlimited Add On' for $19.99/month as you stated, and that will cover all data, PIN messages, internet browser, etc. If you never send an SMS message, you won't have an additional charge.
Thanks! That's what I thought. TMO is a little misleading. Seems like it would be sufficient for them to say no SMS and leave the instant messaging part out. But, since the IM client they provide (I presume) is SMS based, they state no IM.