From Longman Dictionary of Contemporary Englishphone boxˈphone box noun [countable] British English 
TCTa small structure that is partly or completely enclosed, containing a public telephone
TCTa small structure that is partly or completely enclosed, containing a public telephoneExamples from the Corpus
phone box• Charlie'd said he wanted to phone Lilian and when I come back over the road he was in a phone box.• I leapt out of the car into a phone box, and rang through with an apology.• Miracle: a phone box empty.• Despite shock and scratches, she walked to a phone box to call help.• She spotted the out-of-order phone box and drew up beside it.• I rang his sister from a public phone box.• She takes it and makes for the phone box. 