A. 1. Use a valid phone number: If you have a phone number, use it for the signup process. If you do not have one, consider using a temporary phone number service for verification. 2. Check for alternative signup options: Sometimes, apps may offer signup via email or social media accounts. Look for these options on the signup screen.

B. 3. Ensure you are entering the phone number in the correct format: Include the country code and omit any leading zeros.