Many professionals recognise that their smart phone is their main "ordinance" - and would feel exposed to enemy action without it. Its what stops our competitors getting one step ahead. Just as a soldier looks after his gun, we should look after our smart phones - that means regular maintenance (screen wipes, full battery recharges, etc) and YES - a shoulder holster as an appropriate way of carrying and protecting it.Of course there are also those professionals, who having lost their virginity, no longer feel the need for this approach.