
The "Samsung Galaxy S II Swim" will feature a team of high-profile celebrity swimmers, including Ronan Keating and Sir Richard Branson, crossing the 56 miles between Holyhead in Wales and Dublin in the Irish Republic, on 31 September.
The charity aims to raise £1m and Samsung will donate £3,500 for every mile the team swims.
The journey will be recorded by the team on Galaxy S II smartphones and Galaxy 10.1 tablets. Content will be shown on a dedicated site, .
Frances Milner, supporter-led fundraising director at Cancer Research UK, said: "We are delighted to have Samsung on board as our headline sponsor. This is a tough challenge – the Irish Sea is almost three times the length of the English Channel, but we have a great team who are all motivated by our aim to raise £1m.
"Every two minutes someone in the UK is diagnosed with cancer and so events like this are vital for raising money for our lifesaving work."
Last month, Cancer Research UK released an emotive campaign featuring family members talking about their loved ones’ lives with cancer, and asking consumers to donate £2 a month to the charity.