As far as I know there are no cons in unlocking an iPhone if we select a good unlocking source.If we unlock, the user is able to switch networks, avoid data roaming, high resale value for the phone.To unlock an iPhone the remote unlock service would be a better option because, you need not give your mobile to someone else nor do you have any chance to enter the wrong unlock codes. To get such an unlocking service for your iPhone 4 approach Unlocking4u.com and by submitting the country and network to which the mobile is locked to you will be able to remove the restriction from the respective network. This will be a permanent unlocking solution.
