do u mean 3g to 2g or totally off the mobile data? is under setting > wireless > mobile network> Use packet data or i install quick setting, then put in the home screen.. just click on button to on and off.. convenient..

I tried to set this, but can't find data in setting. What I do is , in menu I choose add -shortcut-settings. Can help me?

The Navigation function in Google Maps 5.0 and above  cannot work in Malaysia and many other countries. If you want to have voice assisted navigation , you can installed the brut version of google maps .

Refer post# 2 Q10 n 11 : I have post link to download brut and instructions how to installed it

---

Added on February 8, 2011, 2:49 pm
Good price . Are the edges smooth and soft ?

Brut Maps can work perfectly in presence of Google Maps ( as long as it is ver 5.0 and below ) and vice versa. You will notice when Google Maps 5.0 was released many Android phones cannot install the brut version unless the official ver 5.0 is removed. Those that were able to install has incompatible issues , example like you say force closures. The best way to get rid of these FC is just to uninstall the official version and just use the brut version or use official version but no navigation.

Before ver 5.0 one could use the official version to locate  and use Brut to navigate. No one really knows when Google will licensed out navigation to countries outside USA and UK - apparently a lot of licensing money is involved to get the other country governments to agree to it. Many had speculated that if this goes through , it would not be free anymore

Anyway some guy in China had cracked Google Maps 5.1 to have voice assisted navigation. Interested - just google for the APK file with name maps5.1xxxxTiger. You have to remove the official version before installing this cracked APK. I did not try but based on the forum reports, it seems to be working well.  It is not appropriate for me to point out the source. Just a tip and further  discussion on this cracked APK not encouraged here