What's the use of mobile phone number in plain text?

It's no use. Very risky. Displaying the mobile phone number to others in plain text will lead to risks. For example, criminals or advertising companies can use the public mobile phone number to send harassing calls and text messages, and attackers can send false links through text messages to steal personal information and passwords. Protect your privacy and safety, and don't disclose my mobile phone number to people or organizations you don't know.