Yealink SIP-T29G User Manual page 181

You can store text messages in your phone's Inbox, Sentbox, Outbox or Draftbox. Each
of the boxes can store up to 100 text messages. If the number of the text messages in
one box is more than 100, the phone will directly delete the oldest text message in the
box.
Note
SMS is not available on all servers. Contact your system administrator for more
information.
To read a text message:
1. Press Menu->Message->Text Message->Inbox.
2. Select the desired message and press the View soft key.
Note
If the phone prompts receiving new text messages, you can also press the View soft key
to read the new messages directly.
Advanced Phone Features
171