The company I work for is small and never had any type of employee handbook. The phone comes in handy to relay information concerning the situation.
With that said, I hate getting phone calls while at work. I am at work, I do not need a phone call unless it is an emergency. I broke my wife of calling me while at work real quick, she will send a text if she wants to express something.
I have customers and GC's that once they got my number would call me instead of the office. That was fine when we were slow, but after we picked up I ended up forwarding all calls to my number back to the office. That broke that habit for all but 2 GC's.
I used to have a co worker who had a girlfriend he shacked up with call him at least 4 times a day. I would get pissed when in a hot attic waiting on him either to pull the wire, push the wire or whatever was needed when 2 employees are working together on a project only to find out he stepped away to answer his phone and talk to his GF.
