Avoid the update.
I'm in the UK and got the OTA update to 4.3 and it's ruined the phone
As you can see from the Vodafone forum link below.
https://community.vodafone.ie/t5/Sa...le-for-Samsung-Galaxy-S3-via-Kies/td-p/133270
It's a common problem to many. It has made my phone next to useless.
DO NOT UPDATE, I REPEAT, DO NOT UPDATE.
Nick