I have a dumb-assed old cellphone. The smartphone was too smart for me...
There's more at the link for the Smartphone user...Your Cellphone Is ... Destroying Your Ability to Focus
You don’t own your phone—it owns you. Researchers in Finland found that most people obsessively check their menu screen, news, e-mail, and apps, even though the likelihood of seeing new and interesting information keeps decreasing. “The more you do it, the less you gain,” says study author Antti Oulasvirta, Ph.D.
Your move: Oulasvirta recommends setting specific times to touch base with your touchscreen, such as on the hour—or half hour if the withdrawal is too much.
4 Ways Your Smartphone Is Hurting Your Health