Network Mode

Here's some useful setting to optimize your mobile connection using Galaxy Y.

We'll find a Network Mode option at Settings->Wireless & Network setting->Mobile Network setting. turn off packet data first to change this setting.

what effect it does to you?

GSM only

this will limited your connection to G(GPRS) or E(EDGE) only. 

save more battery but slower connection

W-CDMA only

this will force your connection to 3G or H(HSDPA) only. 

drain more battery power but faster connection

GSM/W-CDMA (auto)

this will search for the best connection available. it could be G/E/3G/H (but mostly E for me)