I have iPhone 3GS with an upgraded iOS 6.
How do I use iMessage?
See Here > About Messages
Turn On iMessage by going to Settings > iMessage > Enable
And here if you need to...
Will iMessage work on iPhone 3gs?
Because previously my iMessage was ON.
iMessage requires iOS 5 or later...
Okay. Thank you. I will get back if any help required.
Retrieving data ...