New York is replacing phone booths with LinkNYC stations. These things provide free Wi-Fi, you can make calls to any state from them (plus a special SOS button for quick 911 calls), and even charge your gadgets. All completely free for users.

And free for the city too. They don't spend a dime from the budget on implementation or maintenance. The system is run by a private company and supported by advertising revenue. Over 12 years they planned to make $1 billion (!) and give half (!!!) to the city's budget. But after the first 4 years of operation, it became clear that those projections were way too optimistic. Not least because they didn't charge for advertising from local small businesses and nonprofits.