Quickly Find Out If Gmail Chat Contacts Are Using Android Devices
When using the chat feature in Gmail, it can be useful to know if contacts are using Android devices or computers.
Green Robot! comes in handy in determining that. To enable it in  :
Sign into Gmail, click on the gear icon and choose Settings.
Next, go to the Labs section and scroll down to Green Robot!
Enable it and at the bottom of the page  hit”Save Changes”.
The Gmail inbox...