on 02-08-2019 16:11
You can change your marketing preferences in your MyO2 and also try blocking the sender on your handset.
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
on 02-08-2019 21:45
It's probably a media message about Priority. As said, change your preferences unless there is a reply STOP marketing included.