Does it cost money to text other kinds of phones on Iphone?

I recently got an iphone and i know its free to text other apple devices using imessage, but is it free to text phones that aren't made by apple? Like a blackberry? Or does it cost money?

Yes, you will be charged the standard per-message rate according to your cell phone plan if you text other devices that do not run iOS. Hope this helps!

It all depends on the plan you have with your carrier. I have an iphone5 with a plan for unlimited texts so I pay$10/mo.

You will be charged unless you have a text plan like 200 msgs for $5, unlimited texts, etc… Otherwise its a per message charge. The other thing you can do is tell your friends to install something like voxer so you both can talk or text through that, but both need to have it installed.