Sony has joined HTC and Nokia in helping O2 towards its goal of taking all phone chargers 'out of the box' within the next two years.
The latest Sony Xperia smartphone will be sold by O2 without a charger when it launches this month, as the company attempts to reduce the environmental impact of phones.
O2 will sell the Sony Xperia SP with only a USB to micro-USB cable, which owners will be able to use with a mains adapter or a USB port on their PC or laptop. If they require a mains charging unit they will be able to purchase one from O2 at a discounted price.
Sony is the third mobile manufacturer to join O2's Chargers Out of the Box scheme. Nokia has also agreed that its Lumia 925 smartphone should be sold by O2 without a charger when it hits shelves next month.
O2 carried out trials with HTC smartphones in which 82% of customers were happy to buy the handset without a charger.
Ronan Dunne, chief executive of O2, said: "As an industry, we have a duty to our customers to behave in a way that is environmentally responsible, making our businesses leaders in sustainability.
"Taking chargers out of the box is a small change that has a huge environmental benefit - cutting down not just on water, but also the environmental costs of transport, storage and component manufacture."
According to research by O2, around 70% of all existing mobile phone users have an interchangeable USB charging unit that can be used with almost any handset. However, 30 million new phones are sold each year in the UK with this piece of equipment included.
The new Sony Xperia SP is a lower-spec version of the flagship Xperia Z smartphone released by Sony earlier this year. Powered by Android Jelly Bean software, it features a dual-core 1.7GHz processor, 1GB RAM and an eight-megapixel camera with LED flash.