call girl

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A woman prostitute who arranges appointments by telephone or computer.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A female prostitute, especially one who is hired by telephone.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a female prostitute who can be hired by telephone