(Pocket-lint) - Now's the best time to trade-in or sell your iPhone. Why? It's because prices will soon fall due to the iPhone 12 launch. The best thing you can do is confirm a trade-in price now to ensure you get the best price you can.

Prices offered are about to fall

CompareMyMobile reckons you have four days grace following a new iPhone launch to sell or upgrade in order to get the best value. Yes - that's now! 

The trade-in site says that in the week leading up to an Apple Event and in the four days following the event, the value of iPhones don't really depreciate but that subsequently prices significantly declined.

Most trade-in sites will guarantee the offer they give you for a week or two - CompareMyMobile, for example, will guarantee your iPhone trade-in price for 14 days.

MusicMagpie says that handsets could lose up to 30 percent of their value in the 24 hours following an Apple announcement. Compare and Recycle believes that depreciation is lower on models with lower capacities. So lower capacities make more sense if you're going to sell and upgrade year after year. 

Interestingly higher capacity models are the best bet if you're going to keep your phone for a long time - particularly if you are going for a 'Pro' iPhone.

What can you expect to get for your old iPhone?  

In terms of recent iPhone handsets, let's look at the iPhone X and XS. MusicMagpie reckons the iPhone X has held its value higher than any other Apple model released in recent years. After six months on the market, the iPhone X had a trade-in price of £610 - a 39% deprecation rate. The iPhone XS trade-in value was only £404 after six months.

Compare and Recycle suggests that iPhone X trade-in prices broke records in July. The company's price tracking data revealed a spike of 15 percent in resale prices for the first time in 8 months.

The recycler says iPhone 11 was a different proposition to the iPhone X and XS because it was launched at a cheaper price point than the XS. However, the trade-in price of the XS was almost 50% less than the retail price, while the iPhone XR held its value better. 

Lower capacities retain more value

Compare and Recycle suggest that lower capacities retain a higher percentage of their value. The 64GB iPhone 11 has held 72 percent of its value at present compared to the 256GB iPhone 11 Pro Max which is 53 percent.

We've known for some time that iPhones tend to retain value better than other handsets. Compared with Samsung devices, Apple prices remain very favourable compared to rivals such as Samsung. Five months after launch the S8 Plus retained 52 percent, the S9 Plus 51 percent, and the S10 Plus just 41 percent.

The Google Pixel 3a lost a whopping 62 percent of its value, while the Huawei P30 (not P30 Pro, note) has a trade-in value of just £75, losing a massive 89 percent.

What about Apple GiveBack?

Apple also offers its own program, called Apple GiveBack in the US, or the link here in the UK which enables you to trade in various devices (they don't have to be Apple-made) in exchange for an Apple Store Gift Card.

However, the prices quoted often don't give you as good a deal as you can find elsewhere. Rival recyclers are quick to jump on this, of course, with SellMyMobile going so far last year as to issue a price comparison chart of the contrasting prices offered for the iPhone X. As always, our advice is to shop around. 

Writing by Dan Grabham.