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Voice Messages Mobile Data Off

It makes no sense. If your calls are diverted to voicemail because the phone is unavailable then the call never goes to the phone, and hence the phone settings cannot matter. I've never heard of anything like this before (and have been using Android for 8 years).

Who is your service provider? Unless you have some very strange setup I've never heard of before voicemail is a network service rather than a phone feature, so we need to know who your carrier is.
 
My carrier is Optus.

When my data is turned on then I get a multi-media message and voice recording left by the caller.

When it is turned off then I get a notification box that says "no subject" and when I click on that it says, "failed to download attachment from multi-media message"
 
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Well MMS do require data to download them. But what has voicemail got to do with MMS? Does your carrier have some setup where it sends voicemail messages as MMS? That is unusual.

I've known phones that hide the fact that MMS uses a data connection (basically turning on data temporarily to download). Can't say how common that is because I very rarely receive MMS (i.e. I've received 1 in total in the 6 months I've had my current phone, and that's an unusually high number - I don't know anyone who still uses them really). But yes, many, maybe most, require you to explicitly turn data on to receive MMS. So if your voicemail uses MMS I can believe that you need a data connection.

And of course iPhones often handle voicemail their own way (the "visual voicemail" feature, if the carrier supports it).
 
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