Your message will be sent to the recipients as a text message and you will be charged by your mobile operator for each message sent. Replies of your recipients are sorted separately.
HTC U Ultra also organizes message replies in a single conversation thread. If this is your first time to send a group MMS, you may need to enter your mobile phone number.
Or in dual SIM models, tap Slot 1 or Slot 2 to send the message.