Bell is CDMA network. You cannot unlock it to use with a GSM network. Instead you can get any GSM network locked Blackberry, unlock it and use it with Rogers. You can unlock a Blackberry phone safer and easier using unlock code. You can get the unlock code for a Blackberry phone from UnBBLock.com at affordable cost with easy unlocking guide. Once you have unlocked the device and inserted your SIM in it, Your previous plan will continue normally. It wont change.