His latest tactic: Giving up his phone number and using X exclusively for calls and texts.

By default, only mutuals can call each other on the platform.

Xenabled audio and video callson the platform last October.

Only people who pay for X Premium, which starts at $8 per month, can call other users on the app.

Only people who pay for X Premium, which starts at $8 per month, can call other users on the app.Illustration: Jody Serrano / Gizmodo / Win McNamee / Getty Images

Platforms like WhatsApp also use confirmation codes through SMS when people want to create an account.

Many banks and other services still only offer two-factor authentication through SMS.

The U.S. government would agree.

President Donald Trump and billionaire oligarch Elon Musk at UFC 314 at the Kaseya Center on Saturday, April 12, 2025, in downtown Miami.

Update 2/9/2024, 10:12 a.m. News from the future, delivered to your present.

Mark Zuckerberg, chief executive officer of Meta Platforms Inc., during the Meta Connect event in Menlo Park, California, US, on Wednesday, Sept. 25, 2024.

Elon Musk, CEO of Tesla, during a cabinet meeting at the White House in Washington, DC, US, on Thursday, April 10, 2025.

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Donald Trump and Elon Musk speak in the Oval Office before departing the White House on his way to his South Florida home in Mar-a-Lago in Florida on March 14, 2025.

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U.S. President Donald Trump speaks to the media during a guided tour of the John F. Kennedy Center for the Performing Arts before leading a board meeting on March 17, 2025 in Washington, DC.

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U.S. President Donald Trump speaks to the media during a guided tour of the John F. Kennedy Center for the Performing Arts before leading a board meeting on March 17, 2025 in Washington, DC.

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