Now's the best time to trade in or sell your old Samsung Galaxy handset. That's because trade-in prices are currently as high as they're going to get before the Galaxy S10 series is launched on 20 February. 

MusicMagpie has reported that Samsung handsets could lose up to 35 percent of their value once the S10 is available on the streets next month. 

If you're trading in last year's handset, you can expect to get around £300 for the Galaxy S9 and £340 for the S9+. That's if you act now rather than after the S10 has been announced. 

MusicMagpie also adds that if the S10 follows the same depreciation pattern as its predecessors, it's set to lose at least 50% of its value in the first month after launch. This happened with the Galaxy S6, S7, S8 and S9 series.

Usually, you have a few days of grace after the event while prices are still OK, but after that trade-in prices tend to decline significantly. Most trade-in sites will guarantee the price they give you for a couple of weeks. 

The best thing you can do is confirm a trade-in price before the Galaxy S10 launch event to ensure a high price on trade in. 

Samsung is also offering up to £200 cashback if you trade-in direct

Almost everything about the Samsung Galaxy S10 has leaked recently and we've got a fairly good idea about the Galaxy S10 price as well. The 6.1-inch Galaxy S10 will be £799 for the 128GB model and £999 for the 512GB model SIM-free. The larger 6.4-inch S10+ will be £899 for 128GB, £1,099 for 512GB and £1,399 for the super-sized 1TB model.

You can register to receive availability details at Carphone Warehouse here: 

We'll find out the full details at Samsung's Unpacked launch event at 1pm ET, 11am PT, 7pm GMT and 8pm CET on 20 February.