Google has released an update to its Google Mobile App, adding support for Search by Voice for second- and third-generation iPod touch models. Originally released in late 2008, the Google Mobile app is supported on all iPhone OS devices, however the ability to search by voice was originally limited to the iPhone only. This latest update allows iPod touch users with an external microphone to access Voice Search and provides other related stability improvements. Google Mobile App is available on the App Store as a free download and is compatible with iPhone and iPod touch devices running OS 2.0 or later. The Search by Voice feature requires an iPhone or a second- or third-generation iPod touch.