It's an MMS message you have sent by including a subject to the message line on your phone.
You can turn off the subject line in settings.
Other common causes of accidental MMS here
https://community.o2.co.uk/t5/Other-Products-and-Services/Accidental-MMS-Sending-and-How-to-Avoid-it...
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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