Why must the mobile number be entered in the provided field?

Entering the mobile number in the provided field is crucial for contact and security verification purposes. This practice enhances the overall security of the account by allowing for two-factor authentication, where a user may receive a verification code via text message. This step ensures that even if someone else gains access to the account credentials, they cannot log in without also having access to the associated mobile phone to receive verification prompts. Additionally, a mobile number may be used by the service to contact the user in case of account-related issues or security alerts, ensuring that users can promptly address any potential threats to their accounts. This approach helps to maintain the integrity and safety of the user's sensitive information.