It doesn't require a phone number. Created an account the other day with only email.
The pattern of "not having provided a phone number" perhaps?
I tried to contact the support, but they never responded.
[0] different accounts, based on different interests
Ok, let's try it with the "Twitter privacy policy inquiries" form (while logged in). Nope, can't submit anything, because of the suspension. So why not have some fun? Just sent a GDPR request via the "suspension appeal" form. Why? For the lulz and to have some legal leverage.
Not even five minutes passed and I got a email. My account is not suspended anymore... WTF twitter?