1.On the Dialler screen, tap Tools → Options...
You can also access the screen by tapping the Start menu → Settings → Personal tab → Phone.
2.In the More tab, select an appropriate band in the
3.Tap Set and then Yes.
4.Tap 
.
SIM lock
When this option is enabled, your phone only works with the current SIM card.
To enable or disable the SIM lock feature:
1.On the Dialler screen, tap Tools → Options...
You can also access the screen by tapping the Start menu → Settings → Personal tab → Phone.
2.In the More tab, tap SIM Lock → Get Settings.
Your phone
3.Select Enable SIM lock or Disable SIM lock and tap Set.
4.If enabled, enter a password in the Old password field and the Confirm Password field.
5.Tap OK.
6.Tap 
when a confirmation message appears.
Fixed Dialling Numbers (FDN) mode
When this option is enabled, your phone restricts your outgoing calls to a limited set of phone numbers, which are stored on the SIM card.
1.On the Dialler screen, tap Tools → Options...
You can also access the screen by tapping the Start menu → Settings → Personal tab → Phone.
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