If you have any information about iphone how to unlock and upgrade it do you ?.So I suggest you please stay away,because you don't know anything its looking like you heard from some one conversation "iphone oh man don't buy, you know why if you upgrade to newer OS then you lost your unlocking and wait for a long until new unlocking will be release.Really thanks you save me:glass-surprise:".
@aroraanant Don't be panic,If you are purchasing factory unlocked there is no issue and if you manage to get software unlocked version which obviously its a cheaper but don't worry you can upgrade to new OS or firmware without losing any your unlocking before upgrading to newer FW you have to do few things.And please decide which handset you want don't lie on other choice because every person is different point of view.Same as like me i am using iphone because like it the app,screen, touch sensor and easy to use in my daily life and yes its expensive so what don't buy

billion of iphone 4 already sold this my second iphone 4 and I know how much and why I am paying for it.Ask some here "I give you choice to buy a phone iphone 4 and any other good android and decrease the the price of iphone then see the result.If you there is not lot of difference in price when you compare the product and company apple product always expensive because its worth and they charge premium its like monopoly (ex-Microsoft).So please its up-to you and if concern with price and your budget is limited then you have to decide.However you are king because customer is king

its your money do what you want to do.I just only give you information and share my experience with you and your is looking very confused

.I am not sure but I have a feeling you made your mind for iphone4 but some force are stopping you

am I right

cheers.