• Apple iPhone 7

Apple iPhone 7 (Photo : Twitter / TheVerge)

Apple has officially introduced the iPhone 7 and iPhone 7 Plus and as expected the devices are packed with more power under the hood thanks to the A10 Fusion processing chip and a huge camera bump that renders the duo as most powerful shooting smartphones out there. The need to upgrade seems compelling and more so when up to $400 or more of savings can be realized when jumping to the new models. 

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And that's like paying just $249 for the basic new iPhone 7 with 32GB of on-board memory or only $369 for the 5.5-inch iPhone 7 Plus with the same storage capacity but with slightly better camera capabilities. So how to get the next iPhone without incurring too much of a cash damage?

According to Apple Insider, trade in is the way to go, that is users swapping their current iPhones to earn substantial cashbacks, and the publication recommends multiples routes to pick.

The easy way is a toss between the promos dangled by Apple Store and carriers though the latter is not highly recommended for the little value they offer. As for Apple, the highest that a user can get from the tech giant is a $250 gift card in exchange for a perfectly working iPhone 6 Plus that would-be buyers of the iPhone 7 and 7 Plus are willing to surrender. It could be that any of the iPhone 6S and 6S Plus will fetch higher appraisal but the report did not include the swapping details on the handsets.

Of note too is that trading in via Apple will also mean lower monthly payments if customers would opt for the company's installment packages.

But the highest appraisal for old iPhones will be courtesy of giant retailers and gadget outlets specializing in trade-in deals. The former are the usual suspects like Amazon, Best Buy, Target and Walmart. Amazon and Best Buy, for instance, are ready to take in the iPhone 6S Plus that with no scratch and working smoothly will be paid premium of $375, which then can be credited to the purchase of the iPhone 7 and 7 Plus.

Shoppers, however, looking to get the most out of their handsets will want to deal with any of . The three, Apple Insider said, offers nearly identical services that mostly tempt with the following - incredibly high gadget appraisal, payment via PayPal and lock on the trade in price.

The latter works like this: one will close a swap deal with trade in offer of $300 for example then he or she will be given a deadline when to ship the old phone. That means a buyer can continue using the iPhone that is intended to be swapped until such time that iPhone 7 becomes available and still enjoy the same cashback value closed weeks ago.

Of the three, Next Worth carries the highest trade in value for a device and that would be the iPhone 6S Plus that outlet is willing to get for up to $400.

One important reminder for would-be swappers using BuyBackWorld, Gazelle and Next Worth - the value of their old iPhones will certainly depreciate as the actual iPhone 7 release date nears. So it's best to strike deal days before September 16.