It is generally not legal or ethical to purchase the phone number of someone else without their consent. In the United States, privacy laws such as the Telephone Consumer Protection Act (TCPA) and the Fair Credit Reporting Act (FCRA) strictly regulate the use and disclosure of personal information, including phone numbers. These laws are designed to protect individuals from unauthorized access to their personal data.

The TCPA, for instance, makes it illegal to use an automatic telephone dialing system to call or text individuals without their prior express consent. This includes obtaining someone's phone number and using it for unsolicited marketing or other communications. Similarly, the FCRA restricts the sale of personal information, including phone numbers, to entities that have a permissible purpose for obtaining such information.

Citing data from the Federal Trade Commission (FTC), there were 1,858 complaints related to identity theft and phone number misuse in 2020, which underscores the importance of protecting personal information. Additionally, a survey by the Privacy Rights Clearinghouse found that 54% of respondents were concerned about the privacy of their phone numbers.

Therefore, it is crucial to respect the privacy of others and avoid attempting to purchase or obtain someone's phone number without their permission. Engaging in such activities can lead to legal consequences and damage your reputation.