There were zero Android phones in 2007. The G1 launched in 2008 as a brand new platform with no third party apps. In 2007, Windows Mobile was the popular platform for people who liked loading their own software on their phone.
If you were around for the early Android scene you might have heard of XDA Developers — which was named for the O2 XDA Windows Mobile phone.
— Source
Oh wow, I didn’t know about this XDA Windows Mobile phone. I bet these days XDA the community is much stronger brand than that Windows phone.