Can i buy a Iphone 4 from any retailer and use it with Bell?

I have a contract with Bell ( i have a blackberry curve 9360 ) and i still have a bit less than 2 years left to my contract (i do have a Bell sim card) and I wanted to know if i could buy a Iphone 4 full price with no contract from Rogers, Koodo, from Ebay or any company and just change my Bell contract to the Iphone 4 except of my Blackberry, is that possible or do i have to buy it to a Bell store?

Added (1). Even if i buy a Iphone at a Rogers or Koodo store?

You can use your sim card whenever you want. In any phone. Even if you are in contract.buy iphone from ebay or other websites. And put sim card and enjoy.

Just on the purchase of the IP4… BAD IDEA
The IP4 is months away from being discontinued on release of the IP5S.

Apple only support LAST 3 iPhones, discontinued means no longer sold by Apple, any future upgrades are for supported phones some new apps just WON'T WORK

On 12/09/2012 IP5 announced IP 3GS DROPPED, like the year before IP4S IN, IP3G OUT.
no maths IP5S IN…

It may be the cheapest when compared to other iPhones but to invest any money in an OVERPRICED device is a waste as in 2 years you will be using a 5 year old device that came out in 2010. Many have already upgraded from the IP4 in 2012
http://www.itproportal.com/2012/09/06/8gb-iphone-4s-version-be-introduced-iphone-5-launch/
http://www.gsmarena.com/...ew-490.php

There are newer phone better phone and they cost a lot less, giving you more than the 8Gb on the IP4, you should look at eg Sam Gal ACE II or the Lumia 620 for phone with a secondary camera microSd expansion Wi-Fi, GPS, DUAL CORE… AND BLUETOOTH MEDIA TRANSFER (Sharing) which no iPhone even the IP5 has.

Here are the specs only if these phones are Gold Plated will it come in above the IP4
http://www.gsmarena.com/...hone2=5147

In the UK we're all GSM so sim card, with 2 year contracts as standard. Say eg a contract is £36:00 at anytime even day one any unlocked phone or sim locked same network can be bought and used, all we have to complete the contract pay 24@ £36:00. Not required to have the phone supplied by the network we're on

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