NEW YORK ( TheStreet) -- Apple won't allow Google ( GOOG) to distribute its Google Voice application to iPhones through Apple's App Store, according to reports.

A Google spokeswoman said she couldn't say why Apple had rejected the mobile version of Google Voice, the Wall Street Journal reports, noting Apple has previously turned away Internet telephony programs because they repeated certain functions of the iPhone.

Google told the Journal it is looking for other ways of reaching iPhones.

An Apple spokesman declined to comment for the newspaper.

The Los Angeles Times, citing analysts, said Apple is simply protecting against encroachment from a potential competitor and shielding AT&T ( T), its business partner, from losing revenue from subscribers who would use Google Voice to bypass its services.

Google Voice was launched about two weeks ago.

-- Reported by Joseph Woelfel in New York.