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by gtvwill 1227 days ago
Depends on your level of service. Government? No problem, they've got it a dozen times already. Private industry....your pushing it. My security > your need for my number. If you require it for signup and your product/service isn't directly related to phones/calling/using that number for something then my alarm bells be ringing. 11/10 assume your just going to sell it or lose it in some data breach to spam calling tele marketers.