Thursday, Google Incorporated announced that the 1.5 million public domain books that it had previously made available for personal computers would be also rendered accessible on Apple Incorporated’s iPhone and T-Mobile’s G1.

The same day, Amazon.com issued a similar announcement, revealing that the titles on its e-book reader the Kindle would become available on several mobile devices, as well.

Nevertheless, the company, which is planning to release a new version of the Kindle the following week, did not specify and exact date for the launch of the e-books on the cellphones.

Drew Herdener, a spokesman for Amazon, stated that the company was thrilled to put e-books on an array of mobile phones, adding that the measure was in the works.

Even though Google’s intention of getting more e-books into cellphones would significantly increase the number of books that are available to read on such mobile gadgets, it is highly unlikely that the writings offered via Google Book Search would become the most popular, since they are in their majority older books for which copyrights have expired.

In addition, the Kindle’s library has stored a string of current best sellers and books that have been recently released.

Google has revealed that it was planning to make other books available on cellphones in the future, including out-of-print titles and current ones that the company had received permission to scan from publishing companies.

The mobile version of Google Book Search for mobile devices enables users to download printed material more quickly over wireless networks and only displays text, unlike the one for PCs, which offers people scanned images of book pages.