Disable data:
Go to settings -> Wireless and network -> Mobile Networks
Disable Packet data (When disabled it won't send data, so you safe battery)
Network mode:
Same menu, but select Network mode and select the network with the best coverage, GSM, WCDMA or GSM/WCDMA (Auto)
GSM network has usually the best coverage and, at least overhere, WCDMA is crowded. When disabling the latter, it doesn't try to register to WCDMA and, when failing to do so, register GSM.
For the time-out of the screen:
Go to settings -> Display -> Screen time-out and select the time-out you would like to have. I've set mine to 1 minit, as I think 15 or 30 seconds is annoying. (Especially as I now know that you can lock the screen with a short press of the power button)
I hope this helps.
Go to settings -> Wireless and network -> Mobile Networks
Disable Packet data (When disabled it won't send data, so you safe battery)
Network mode:
Same menu, but select Network mode and select the network with the best coverage, GSM, WCDMA or GSM/WCDMA (Auto)
GSM network has usually the best coverage and, at least overhere, WCDMA is crowded. When disabling the latter, it doesn't try to register to WCDMA and, when failing to do so, register GSM.
For the time-out of the screen:
Go to settings -> Display -> Screen time-out and select the time-out you would like to have. I've set mine to 1 minit, as I think 15 or 30 seconds is annoying. (Especially as I now know that you can lock the screen with a short press of the power button)
I hope this helps.