A. 1. Ensure that your phone number is entered correctly, including the country code. 2. Check your network connection; switch between Wi-Fi and mobile data to see if that resolves the issue. 3. Restart your device to refresh the network settings. 4. If the problem persists, try using a different phone number to see if the issue is specific to your current number.

B. 1. Check if you have any SMS blocking apps installed that might prevent the verification code from being received. 2. Contact your mobile service provider to ensure that there are no issues with receiving SMS messages.