Lots of ways to talk to the person you want to.
JWP1938.
On the ground I can communicate to the “Company” in a number of ways. But before I get to the different was to communicate there are several different representatives of the “Company” I can get in touch with.
There is “Maintenance”. The people on the ground tasked with keeping the aircraft mechanically fit to fly. This may include the de/anti-icing activities.
Then there is “Operations”; they are responsible for numerous necessary tasks including; cleaning, catering, fueling, local staffing issues and many others.
There is my dispatcher, the person who co-authorizes the flight with me the Captain of the airplane.
And there are management and/or their representatives personnel; base Chief Pilots, System Chief Pilot, Instructors and crew schedulers.
I have 3 radios that transmit and receive on my jet. Using the company communications frequency (2 of the 3 radios I can tune in the flight deck) I can talk to the person I want to, or they can contact me.
I have a data link function that uses the 3rd radio that transmits to several of the previously mentioned parts of the “Company”, this is more like sending/receiving texts and faxes.
I can step off the jet and pick up a telephone located at either end of the jetway and simply call the person I want to speak to. Finally, I have my personal cell phone that works as well (on the ground, next to the jetway, with the aircraft door open {same restrictions as you have}).
Once I am in the air I still have my 3 aircraft radios. Those provide both voice and data. And I can always ask ATC to relay a message if necessary (not necessary most of the time). As a certification requirement we are required to be able to contact the company, and the company contact us, at all times while we are in flight. Using one of the communication radios I can access a ground network of transmitters/receivers and talk to just about anybody who has a telephone if necessary.
Northbeach