1.Yes. You can Flash a stock ROM in the download mode.
2. If you flash a stock ROM, your download counter will not increase and Samsung will not know you played around with your device.
If you flash some insecure kernel (modified ROMs) via ODIN t...
Follow the below link and flash CWM recovery
The recovery you have in your device is native device android recovery(stock recovery); that comes inbuilt with you ROM.
You have to flas...
From Samsung Website: Battery
Talk time*: up to 22.5 Hr (2G), 9 Hr (3G)
Standby*: up to 660 Hr (2G), 550 Hr (3G)
* The talk time and stand-by time are approximate. Performance of the battery is subject to the network, signal strength, function,...
Can you try GPRS in a virgin state without any apps? Just worry any network monitor app is blocking it?
Reset the network settings and try again.
Try this if in case above doesnt work~~
Flash your stock ROM and see if any improvement..Otherwise service center is the only choice..
Seems like a faulty LCD...Can go for a warranty RMA..