There are some possible reasons:

• Please recheck your nickname according to the requirements which are:
  • Nickname in one word with minimum 3 characters and maximum 12 characters.

• There might be a failure in delivering the message. Please resend the registration message.
• The server might be busy. Please wait a while and the resend the registration message.
• Connection problem might occur at your mobile operator. Contact your mobile operator about this.
• If all fails, please contact us for further help.