depending on your plan you may need to request your provider activate international roaming for you to pick up signal... i've had bell and telus work for me, am assuming my fido will work too... you may need to work a little harder to push data to the blackberry, but they are alive and well in Jamiaca and a world edition should be able to pick up the correct provider to get data service if absolutely necessary...

but i never use home cell as the rates are just as ridiculous... 1.99 per minute long distance and 1.99 per minute roaming is the norm... do a search for digicel.. 1000 minutes for 999J (about 12US) takes an unlocked dual (North American), tri or quad band phone (either yours or one purchased there) and a digicel SIM card (7USish) to use... but no other hidden fees (other than taxes)... Incoming calls and texts are free (to you) on digicel, outgoing texts are reasonable... very very affordable and flexible...

Hope that helps...