Bill J. wrote:
Is there an acceptable (legally and to the phone company) way to
install phone wires and exterior service box such that one's phone
service cannot be easily disconnected by burglars, etc. without(at a
minimum) noisy methods and tools?

Overhead service or underground?

If underground, the following is easier:

Use a 6-conductor cable. Splice the 4 telephone wires to 4 of the conductors
in this new cable.

Connect the remaining pair to a fault alarm such that when they are cut, all
hell breaks loose: sirens go off, dog kennels open, giant floodlights shine,
moaning, etc.