To set HTC's app as the default, tap
Messages app can send and receive both SMS and MMS and allows Group Messaging (if the device and your mobile operator support it).
If you created a task in the
Tasks app and linked it to a contact, the task will appear when the contact calls and if the contact has no recent status update.
Or, go to your
Apple support profile on the web and unregister your
iPhone and other
Group MMS is like group chat, where recipients can join a conversation you've started. Replies are also organized into a single thread.
Some devices or mobile operators may not support this feature.