Im looking to buy an iphone from Rogers and its network locked?

[Kwaila]

is it possible to lock it again after i unlock it? And what are the cons and pros of unlocking an iphone?

 

[priyakalai]

is it possible to lock it again after i unlock it? And what are the cons and pros of unlocking an iphone?

ya,it's possible.
If you upgrade your iphone it's possible to lock again.So you need prevent this try to unlock after upgrading.You can unlock your iphone using Remote unlocking method.It's the best way to unlock your iphone.If you are interested in this method visit onlinegsmunlock.com Here you can unlock your iphone without jailbreaking.