IF YOUR ANDROID REFUSE TO SWITCH TO 3G

Hi bloggers if your andriod doesn't see 3G or

 you cant toggle between 3G and 2G.

If it doesnt see 3g.. try

1.Open the Dialer and Dial *#*#4636#*#*

2.Tap On "Phone Information".

3.Scroll down you can see "set preferred network type"

4.Change it to "WCDMA preferred".

5.Do not touch any other settings and come back to home screen.