Cell phone coverage in Grenada
 

Can anyone tell me (with 100% certainty) if my Canadian iPhone 5 will work in Grenada?

It depends on who YOUR Canadian Service Provider is and if you have International Service. Call your provider and ask if they have a reciprocal agreement with either Digicel or LIME (aka Cable & Wireless), if so, you phone will work.

Precisely. I have an old iphone3 which works everywhere I go but that's down to my network and not the phone. I have sep SIM cards for countries I spend alot of time in to cut down roaming costs.

Thanks very much!