iPhone with Blackberry data plan?

I am probably going to pick up a cheap iPhone EDGE on eBay. (EDGE because I am on T-Mobile so I can't use 3G anywho) Nooooo way am I giving up my 8900 but I just want to play around with the iPhone and probably use it for web browsing on the go.

I have unlimited data and texts from T-Mobile. When I unlock my iPhone and put in my SIM, will everything work okay? What works and what doesn't exactly when you use the iPhone with a Blackberry plan?

Should work fine.. you wont have visual voicemail however.

Eh, that's fine :)

I'll probably just switch occasionally between my BB and my iPhone. I just won an iPhone EDGE on eBay for around 150 bucks so it should be here soon once I pay for it.