Mobile phone permission to employees in workplaces

Having mobile phone in work areas helps for easy communication and decision making.

But, the spam calls, calls from family and friends in working hours cause diversion of attention and may affect Safety at work.

One can't be quiet when phone rings. 

It appears banning phones in work places is more beneficial.  Arrangements can be made for communication in plants through intercom phones at differentareas, public address system, pagers for plants, etc