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You don't say which country you're in. I mention that because here in the UK the service provider takes care of your VM. Not to say that you can't use a VM app but 99.9% of people use the provided facilities. My provider is Vodafone and both the items you want are possible with their VM system
Dave
Thanks for your reply.
Unfortunately, I am using a pre-paid SIM so the voicemail is not provided.