As per title.
I need mobile data on to send / receive mms. Is this by design? Is it an apn setting? Is it a network issue?
Using Vodafone in Australia
In France, no Mobile Data = no MMS
But if you use the RCS, only Wifi is enough.
It sends a digital image so mobile data needs to be on. If the mms will deduct data from your data plan or not is up to your carrier
Shouldn't MMS automatically connect to mobile data in the background?
& in Australia it's included with calls (not data)
Then this will not respect your intention !
If you disabled Mobile data, nothing should re-enable it automatically.