Taiwan-based manufacturer HTC and U.S. network provider T-Mobile previously predicted the sales of the "Google phone" to reach 700,000 by Christmas this year. However, nearly 1.5 million U.S. citizens have already pre-ordered the G1 smartphone, which functions with Google's Android technology, CNet France reported Monday.

The 500,000 T-Mobile G1 phones that have been released have already been bought, leading T-Mobile to order a million additional phones.

The G1's sales figures are reportedly better than Apple's iPhone 3G when it first came out, according to CNet France.

The smartphone will see its commercial launch on October 22 in the United States and will cost US$179, reported CNet France.