Sunstech uSUN200 Manual Del Usuario página 16

• Notices：For now this phone can send messages , you can only
enter 312 characters in the box "recipient".
When a message is sent or sent again，a small yellow letter will
appear. The number 1 or 2 on the letter refers to SIM1 or SIM2.
When message sending fails，a red triangle with an exclamation
point will appear.
When editing information other functions of Menu button
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