Steve Easterbrook, president and CEO at McDonald's Restaurants, said, "More people than ever are looking to access the internet on the move, whether it is on their laptops, mobile phones, PDAs or even games consoles, and free access in our restaurants will provide a quick and convenient way for them to do this."
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The free service, delivered by network provider The Cloud, will be rolled out across the McDonald's estate by the end of the year.
McDonald's restaurants in Belgium also recently announced it was to offer free Wi-Fi.
The UK move will see the company appeal to current Wi-Fi users in coffee chains such as Starbucks, who have to pay for their access.