I have just updated my Galaxy S3 to Jellybean 4.1.1 via Telecom.
I can't find any option to enable split screen. Does anyone know
if this feature is enabled on this update?
On the Note 2, holding the back key brings up the task pane which allows the split.
I have a stock standard S3 (NZ purchased and not jail broken), and ran the inbuilt software update.