To verify the validity of your mobile phone number. For Blued registration, enter the mobile phone number you need to register an account, enter the Blued login password, and fill in the 4-digit verification code. After clicking register, the system will send you a text message to verify the validity of your mobile phone number. *** Verification codes will be sent twice. Blued is a live dating app based on location. Blued can discover friends around you, view their public information, photo albums and updates, and conduct multi-dimensional matching based on your interests and hobbies.