Re-use & Recycle
If you are getting a new mobile phone you can often trade in your old one as a part exchange. Mobile phone companies may also take old phone rechargers and other accessories.
Some charities collect mobile phones and receive money when they recycle them. Some charity shops will also take them.
Sell online at Preloved, which takes electronic items that are too old to fetch a decent price on other websites (contrib: Jo Payne).
There is also a container for unwanted mobile phones at Marlborough Household Recycling Centre.