We all have some cool reminders applications in our phones, that have all the features to remind as at a specific time a task we have to do.

Besides this, as I read in a review/survey, people tend to use paper notes to remind them of something they have to do. A lot of them stick their note in a place that they will sure go there soon, see the note and remember it.

A big group of people tell their family/friends to remind them at the time wanted.

Why people avoid using their phones for this and all of this cool features? I dont think it is because of the battery but like they trust more other people than theirselves.