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VoIP is banned?

Many social media sites don't allow you to register using e.g. Google Voice or Twilio phone numbers, since you can get those for free and/or in bulk, so they assume they're used for spam or ban evasion.

I've seen this on Twitter, which doesn't require a phone number to set up, but it's possible for your account to be flagged as suspicious, and get locked down until you add a phone number.

Ebay and Uber are more.

Lots of banks reject VoIP too.

Twitter does lock you out and force you to give them your phone number, even if you technically can register without one. I’ve seen them do so almost instantly after registration.

That's very concerning. Many phone companies require you to back your hard number to a national id.

Say something bad about insert monarchy... They'll trace you down with that.(Turkcell does that just for wifi at IST)

In many countries they are required to do so by law for acquiring any phone number. Including per-paid. It's not uncommon that it's true for _any_ phone number including VoIP. But a single person as a "company" can get a huge number of VoIP numbers and then "accidentally" get hacked by a illegal phishing call center then using that numbers. Or maybe that persons passport got stolen and used by a similar locking person. Or the passport verifying personal got bribed. Etc.

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