Nokia 2135 - Manual (Page 40)

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Select Menu > Settings > Security settings > Call
restrictions or Access codes .
Network
The Network menu allows you to customize the way your
phone chooses a network in which to operate while you
are within or outside of your primary or home system.
Your phone is set to search for the most effective network.
If your phone cannot find a preferred network, it selects a
network automatically based on the option you choose in
the
Network menu.
Select Menu > Settings > Network > Roaming options ,
Roam call ringing tone or Service change tones .
The menu options you see in your phone are based on your
service provider’s network. The network determines which
options actually appear in the phone menu. Check with
your service provider for more information.