Remember back when you showed up for work, & they expected your Undivided attention for your shift. No phone calls except on breaks or on your lunch break. Emergency calls were received by the office & relayed to you.
Good reason that McD's, HD, Lowes, Wal Mart, KMart, etc employees DO NOT carry Personal Phones [iPhone, iPad, etc] while "WORKING" & computers in house [HD, Lowes etc have Limited access to outside web sites].
Remember when you went to School to Listen to the Teachers?