Samsung Galaxy S7
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Writing and sending picture messages
A picture message is a message which can contain pictures and other media files and can be sent to other mobile phones. If you can't send and receive picture messages as soon as you've inserted your SIM, you need to set up your phone for picture messaging.
Press Messages.
Press the new message icon.
Press COMPOSE.
Press the search field and key in the first letters of the recipient's name.
Press the required contact.
Press the text input field and write the text for your picture message.
Press the attachment icon.
Press GALLERY and go to the required folder.
Press the required picture.
Press SEND when you've written your picture message.
Press the Home key to return to the home screen.