7100i and Nextel Sim Card compatibility question

[Z-town Spartan]

I have a Nextel i850 and i can get a really good deal on the Blackberry 7100i. Do you know if the sim cards are compatable? I dont want to use the data network, i just want to have the calendar and keyboard of the blackberry for texting. will i be able to put my sim card in and use the basic call/DC/text features on the blackberry with no problems? TIA

(sorry if this is in the wrong place. new here.)

[candyman78]

The thing bout Blackberry is they are owned by RIM, and Nextel buys them. the 7100i runs on a rim sim card, and the texts works as an MMS. the phone is provisioned for it on the blackberry network. you can put the sim in and use SOME features/applications. like your phone wil work and PTT will work, cuz they use the nextel network. i'm not sure about the MULTI MEDIA MESSAGING.

The good news is there is a way to get the correct service books to provision it for MMS, i've seen answers to that same question ALL over the forum.