On the first day of the new year, anyone who has a cell phone that’s more than five years old will not be able to use it to access the encrypted web, BuzzFeed News reports. That includes accessing sites like Google, Facebook, and Twitter.

This Internet cutoff is part of a plan to keep encrypted websites secure. According to Ars Technica, these encrypted sites use SHA-1, a cryptographic algorithm, to protect themselves against hackers. Most of these major sites intended to upgrade their security in January 2017 regardless, but because hacking threats have become more imminent, they are upgrading them sooner. As of Jan. 1, 2016, only SHA-2 certificates will be accepted, which people who have older model phones don’t have.

CEO of CloudFlare Matthew Prince recently conducted research with Facebook showing as many as 7 percent of the world’s Internet users might be affected by this SHA-1 cut-off. “It is important to remember that the Internet is not just guys with the newest laptops and an iPhone 6,” he told BuzzFeed.

Of course this isn’t as big of an issue in the United States as it is in developing countries, Prince elaborated: “We didn’t want to be hyperbolic. We wanted to be realistic. For the developing world, on average, 4 to 5 percent of visitors will simply be cut off.”

Credit: Cosmopolitan