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Contacting 121

I assume it's the particular service provider's voicemail service.

@LeithR, can you tell us who your service provider is, and how you contact the service (phone them directly, long press on the "1" key on the phone keypad, click a button on a notification)?

Have you checked that your phone app has the full voicemail number is set correctly in the phone app's settings? That's the simplest reason for it not to work.
 
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