The user puts an elastic strap with Velcro closure around his thighs. On the back of the phone is a piece of self-adhesive Velcro that attaches to the strap.
The strap prevents the phone from slipping/falling. The phone is also always easily accessible and easy to use.
The piece of Velcro on the back of the phone also attaches to a fleece blanket that the user has when he rests in bed.
This tip is from 2015