Huawei Ascend G510 User Guide - Manual (Page 45)

Messaging
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2. In the list of message threads, touch and hold the thread you wish to
delete until appears.
3. Touch .
4. Touch Delete to delete the thread.
Modifying message settings
1. On the home screen, touch .
2. In the list of message threads, touch .
3. Touch Settings.
4. Change the message tone, add a message signature, and more.