Bell is a CDMA network. ACDMA network mobile cannot be unlocked to use with a GSM connection. Only GSM mobile can be unlocked to use with any other GSM connection. You can unlock a GSM mobile using unlock code. All the best mate.
**edited for c...
No your Nokia E5 could have been locked to Rogers network while you are reciving it. If you wish to swap the SIM card you need to unlock it. You can get it unlocked using unlock code.
**Edited for content**