Blackberry question PLEASE look and answer.?

I have a blackberry tour, I dropped it in the ocean last week and it doesn't work (no brainer) My mom has an old phone that isnt a blackberry can she still trade numbers with it or does it have to be the same kind of phone? (We do not want to start another 2 yr contract we want an upgrade soon, so does that mean you have to have the same kind of phonee?)