Mobile phones..

Hi,

I wonder if anyone can help me?

I have just moved to Montreal, Canada from UK and will be here for the rest of the year. In Jan 2013 I will be in US for the rest of the year.

I have an o2 monthly contract using iphone 3g but will need to cancel soon as it's costing me a fortune!.

What's the cheapest option for incoming/outgoing calls, receive/sending text and data allowance where I get to keep my mobile number the same and would I need to change it again when I go to US?

Any advice would be gratefully received.
many thanks

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