Police boxes disappeared quite soon after Dr Who started - certainly some time during the first run of the show. It was explained then that the camouflage circuits of the Tardis had malfunctioned, so that it could no longer change its appearance.
The main purpose of police boxes, although they could be used by the public to make emergency calls, was to enable police officers to check in with their station. They therefore became superfluous when the police acquired personal radios, which was long before cell/mobile phones.
from alt.usage.english
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