This is what I found in Marks FAQ link. Now how I read it, Yahoo mess. is supposed to use data. I not 100% sure, I am still confused about it.
Advantages of Using Instant Messaging Over SMS
Some people have asked what are the advantages of using a dedicated instant messaging client instead of using plain old SMS. Most BlackBerry IM clients such as VeriChat and WebMessenger use data instead of SMS text messages.
Advantages Of Using IM Instead Of SMS:
Some BlackBerry plans have unlimited data, but not unlimited SMS
True 2-way chat, you can type while they are messaging you;
Chat faster, quicker messaging, messages arrive in just 1-2 seconds;
Multitask multiple conversations more easily;
Group conversations are possible in some IM software;
Just hit Enter to send message, and you're immediately ready to type the next message;
You can easily chat to someone sitting at a computer too, not just another phone;
Cheaper than a long distance call;
Disadvantages of Using IM Instead Of SMS:
Cost of software such as annual subscription fee, although this may be still be cheaper than the cost of an "Unlimited" SMS add-on.
Not good if you do not have an unlimited data plan;
Overkill, if you only do very infrequent SMS or IM;
Other people need to run IM software too, or log onto an IM system over SMS. (People can log onto AIM using SMS, so you that SMS users can send messages to your IM client that way.
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