Around half of the outlets owned by ethical sandwich shop retailer Pret a Manger have begun offering free Wi-Fi to customers.
Access to the broadband service is not conditional on any purchase and has already been introduced across 60 stores.
Neither is there a password or access code required by users, which could see some customers taking advantage of it.
Simon Kerry, head of IT for Pret, explained that he hoped it would encourage customers to "stay with us for longer".
He said: "Everything we do at Pret is about delighting our customers; whether its freshly made sandwiches, 'Just Roasted' coffee, or great customer service.
"The Cloud perfectly complements these standards, offering an efficient and high quality connectivity experience no matter what type of mobile device our customers wish to use."
The free service is being provided through The Cloud network and the retailer hopes to extend the scheme across its 130 stores later this month.