I have for a long time been using a phone I was given second hand. Recently an update meant the calendar app stopped working. I also found that none of the alternatives were compatible with the old phone. So it is with some reluctance that it is going to be passed on to someone who doesn’t need that particular facility.
On the bright side, the new one does have a calendar application that is a lot more intuitive to use than the old phone’s and integrates much better with email etc. So it will as long as I can avoid playing with it too much actually save me quite a bit of time.