for those who are going to buy this and you are experiencing LAG and unresponsive screen just follow this instructions:
things you should do first.
1. Remove the Sim card and Memory card.
2. Your unit should have fully charge battery.
Procedure in updating the phone.
1. Turn- on your S3653 W
2. Touch the keypad
3. Enter *#2665#
4. touch the 1
5. Wait for few minutes
6. Done.
it really works!
GOOD LUCK!