i strongly suggest you buy it from here in doha because vodafone offers factory unlocked iphone 4 for QR2,850.. if you buy from doha there will be no problem of locking it again everytime you update it whereas if you purchase it there in canada you will not be able to update it as it will get locked once you do it... in that case you will have to look for a person to unlock it again and pay at least QR 100 to do the job...