You should get a message delivered notification on the HTC One - I do on mine, as long as you select the option in the message app settings.
However, no delivery report is a guarantee as it only ever means its been sent to the recipient so it's not like BBM where you get a "read" notification.
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.Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)
>>>>>>>>>>>>>>>>