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by amjd 3699 days ago
Most VoIP providers let you use any number as the caller ID with a simple SMS verification. So, if you were to have access to someone's phone for a few minutes you could possibly verify it and use the number for making calls and sending text messages from the VoIP service.

I believe the SMS verification is something that companies use to avoid liability alone, technically they can use any number as the caller ID if they choose to.