iPhone 4 is no doubt the best piece of hardware this year (2010). Buying an iPhone on launch day can be a herculean task to say the least! People go to the extent of forming long lines and/or camping outside the stores. If you value time and if you want to save a quick buck, this guide is for you.

First and foremost, you should be aware of AT&T’s dirty tricks.
iPhone 4 buyers fall into 3 categories :

Upgrade eligible
Regular pricing
No-commitment pricing

Upgrade Eligible :
Type in *639# from your AT&T phone and you …