Never mind the telephone.
Here are some of the rules for operating at Popham.....an unlicensed grass aerodrome with Air/Ground Radio service;
The direction of take off and landing must be as indicated by the "T" displayed in the signal square or as directed by ATC.
Aircraft are required to taxi as directed by ATC and all aircraft are required to turn left at end of landing run unless otherwise directed by ATC. In winter when there are boggy conditions ATC will usually ask you to exit left and return to the parking area via the southern taxi way (beside the road).
Aerobatic flying is not permitted over or near to the airfield unless specifically monitored by ATC.
Aircraft should not be parked in front of hangars or clubhouse or in any position which might inconvenience the view from ATC
If wind conditions suggest that it would be safer to use one of our alternative landing strip (03/21), permission should be granted by ATC.
http://www.popham-airfield.co.uk/Procedures.htm
As this probably demonstrates, often it is not the people who actually answer the telephone, it is the people running the organisation who put out such "rules" which basically instruct the A/G Radio operators to go beyond what they can legally do.
Regards,
DFC