Lock In a Trade-In If You Need Extra Cash
The iPhone 7 is expensive and if you need some extra cash to help cover the cost you'll want to look into the trade-in value of your current device. This cash might help you offset the cost of your new iPhone 7 or iPhone 7 Plus.
If you're planning to buy on T-Mobile or one of its competitors, and you own an iPhone 6s, you'll want to investigate its trade-in offer. There are other sites and offers out there so make sure you look into these offers (if you need to) before you place an order.
Trade-in values will fluctuate in September so you'll want to make sure you get top dollar for your old smartphone.