When setting up an email account, a provider may need your phone number for the following three reasons:
Verification
The service provider wants to make sure you are not a spammer or bot. Mail servers' reputation can suffer and resources can be wasted if bots or spammers are permitted to use them. Free email services are a good example of this.
Authentication using two factors
A security solution to safeguard online accounts with more than simply normal login credentials is known as two-factor authentication (2FA). A phone will frequently be a part of the second component or credential.
Account Restoration
You can access accounts for which you've forgotten the username and password using phone numbers. Losing login credentials could be disastrous if there is no way to retrieve the account.
These are the most typical motives for businesses to request a phone number, albeit they are not the only ones. Additionally, it is important to keep in mind that many gmail sign upproviders will still encourage consumers to supply their phone number even if they don't require it.
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