About 4,000 Swedish people have inserted microchips into their bodies so they do not have to carry IDs, key cards, and even train tickets, according to the New York Post.
The chips can also be used to monitor a person's health, store emergency contact details, social media profiles or e-tickets for events.
Jowan Österlund, a former professional body piercer, came up with the technology. His company, Biohax International, is dominating the market.
The technology was first used in the country in 2015.
Swedish scientist Ben Libberton said the microchips are "definitely exciting" but also expressed concerns about privacy.
"The problem is, who owns this data?" he asked. "Do I get a letter from my insurance company saying premiums are going up before I know I'm ill? If I use the chip to buy lunch, go to the gym and go to work, will someone have all of this info about me? Is this stored and is it safe?"
Österlund last year said it did not make sense to have different cards and tokens verifying one's identity.
"Using a chip means the hyper-connected surroundings you live in every day can be streamlined," he said.
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