It is interesting to note that both of these telephone "numbers" -- more correctly, telephone-number mnemonic devices -- are registered service marks. This is because the companies use them as services marks. Key Bank provides 1-800-KEY2YOU telephone banking services that it identifies as particular services under that mark in advertising and promotional literature. Similarly, Federal Express advertises and promotes a particular set of package delivery scheduling services under the 1-888-GO FEDEX brand.