Don't think this has been posted before - at least I couldn't find it when I searched 😊
If you have a P800 on T-mobile UK the code *md# at the beginning of your SMS will give you a delivery report.
Of course, if you have upgraded your firmware then sms delivery reports are now selectable from the phones menu, but for those of us who have yet to do so, this may be useful.
Kind regards to all :P
Gary G