Zte MF645 User Manual page 35

Select "Yes", and then the edited short messages will be sent.
After sent successfully, the SMS will be saved into outbox automatically. If it is
not sent successfully, it will be saved to the draft box automatically.
Sending SMS while browsing the web:
When surfing the Internet, if your network supports, you can send short
messages. Click SMS button icon, enter the short message interface to send
short messages normally.
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