
Back in June, Best Buy ran a single day promotion that allowed iPhone 4 and 4S owners to upgrade their phones to the iPhone 5. The company told USA Today that it was the most successful day ever for its trade-in program and as a result, Best Buy plans to launch the campaign again on Friday, June 21.
Customers will be able to trade in a working iPhone 4 or 4S, earning a credit of up to $150, which can then be put towards the purchase of an iPhone 5, which is priced at $149.99 for the 16GB version. The discounted price includes a $50 instant rebate that will last until the end of the promotion, on June 29.

The promotion, which will begin on June 21 and last for nine days, is only good in Best Buy Stores or Best Buy Mobile locations.
Article Link: Best Buy to Relaunch iPhone 4/4S Trade-Ins for 'Free' iPhone 5