Zte A15 User Manual page 36

Please ensure message service center number has been set before writing messages.
In message interface, select New Msg and press Select to access message
input interface to enter the message. (Please refer to Chapter "Text Input".)
When you finish entering the message, press Options, and then use Up/Down
Key to select Send to One, Send to Many or Save.
Select Save to save messages to the SIM card. When saving, you can directly
input the destination number according to prompts on the screen, or press Names
to select a number in the Names. Select Send to One, you can directly enter the
receiver's number, or press Names to select a number in the Names. Select Send
to Many, enter the group list, select one group and then select the receivers'
numbers. There will be prompt information on the screen after the message is sent
successfully.
Note: The SMS centers of some cities and regions do not support messages longer than
160 English characters.
Viewing Received messages and Saved messages
Select Inbox to check received short messages; select Outbox to check short
30