T-Mobile’s Google Android smartphone has reached one million in US sales in the six months since it debuted in October. The G1 smartphone (also known as the HTC Dream) now accounts for two thirds of all devices on T-Mobile’s 3G service.

It is being reported by mobile advertising specialist AdMob that the Android OS now accounts for 6% for the entire smartphone market in the United States. Though the popularity is increasing, Android still has a while to go until it beats out Windows Mobile, which holds an 11% market share, the Blackberry OS at 22% and the iPhone, which takes the cake with 50% of the smartphone market in the U.S.

During a conference call last week Eric Schmidt, Google CEO stated that he felt the Android had a chance for great success this year. Schmidt claimed that the open source strategy was gaining ground and hinted that the company would deliver future announcements.

Other companies including Acer, Samsung, Motorola, and Sony Ericsson are also developing their Google OS powered devices.

[via TG Daily]