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If you restart your phone the voicemail service should be active for you now.
I'm having the same issue. I recently lost my phone & had to get a new SIM to reactivate an old handset. My voicemail hasn't worked since, even though I can listen to my personal message.
In touch settings are also deactivated and I'm going round in circles on the menu and can't find out how to reactivate them.
Hope you can help.
If you could private message (via the link in my signature) over the below info, I can look into this for you?
Date of birth:
Link to your thread or post: