Is there a texting/chatting app that supports Android, iPhone and Blackberry?

My friends and I want to do group texting/chatting, but the problem is that we all have completely different phones.

What's the best app to use that's available for all 3 devices? Maybe even Windows phones too?

Text plus and kik messanger are the two big ones.

Yes! It's called texing, an amazing invention that has been out for years and is already built into every phone! So you dot have to download it: D and the best thing is it can be used on any and too any phone! All you need is there number.
Source - user for years!

Anyway all serious now! It's called what's app and I think it can be used to any! Have fun chatting!

WhatsApp

Hi

you will be glad to hear that bbm(black berry messenger) is going to come on android and ios, the os. Version requirement for android is ics(ice cream sandwich) and ios 6.0 or higher os for iphones. So don't download any other app bbm is the best!
Hope i helped:-)

You can use whatsapp or viber if you are located in different countries for free. The issue with those programs is whomever you are texting with will also have to have those programs on their phone. If you all live in the same country, you can text with each other, but I would suggest a texting plan so that you don't receive a phone bill shocker. Text messaging charges can add-up quickly if you are not on an unlimited or high usage plan.