https://techcrunch.com/2022/12/12/twitter-will-require-phone-number-verification-to-purchase-a-twitter-blue-subscription/

After announcing the relaunch of Twitter Blue over the weekend, Twitter updated its terms to require phone number verification for users who want to purchase the subscription. The company said that if you haven’t verified your phone number, you will be prompted to do so while buying the subscription plan.

What’s more, the company may also prevent users who have changed their handle (username), display name, or profile picture within the last seven days from purchasing the Twitter Blue subscription.