Fixed dialling
With the fixed dialling service, you can restrict calls from your device to certain phone numbers. Not all SIM cards support the fixed dialling service. For more information, contact your service provider.
Select 
> Contacts and Options > SIM numbers > Fixed dial contacts .
When security features that restrict calls are in use (such as call barring, closed user group, and fixed dialling), calls may be possible to the official emergency number programmed into your device. Call barring and call diverting cannot be active at the same time.
You need your PIN2 code to activate and deactivate fixed dialling or edit your fixed dialling contacts. Contact your service provider for your PIN2 code.
Select Options and from the following:
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Activate fixed dialling or Deactivate fixed dialling — Activate or deactivate fixed dialling.
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New SIM contact — Enter the contact name and phone number to which calls are allowed.
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Add from Contacts — Copy a contact from the contacts list to the fixed dialling list.
To send text messages to the SIM contacts while the fixed dialling service is active, you need to add the text message centre number to the fixed dialling list.