Developers have managed to get Android Ice Cream Sandwich to install on the first Android phone: the T-Mobile G1. It is going to be an early version of the software, which still needs to be optimized.
The rom is found on the ontwikkelaarsforum from XDA and it was also a demonstration video released. Is Android ICS operating to see, but at the moment it seems the software is still too slow for daily use. For the rom developers have the ICS code used by Google as open source is released.
In addition, the creators, not all of the hardware working. How it works wi-fi and also bluetooth and screen rotation are still not functional. Future versions should fix this; the current version is still in the alfastadium.
It is noteworthy that in ICS, the latest Android version, the G1 can run. This unit was in 2009 released the first smartphone with Android, and has long been no official updates anymore. HTC has the phone created and also under his own name released as the HTC Dream. Developers porting it to earlier Android versions 2.0 and 2.2 for the T-Mobile G1, while the original software on Android 1.6 is stuck.