I have a new iPhone XR 128 gig (2months old) and in my he last couple of days it has gotten really hot even when I’m not using it and I just checked my Optus app and the usage has increased from 600-800 megabytes a day to 8-10 gigabytes a day what would cause this?
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Sounds like it's doing the cloud backup thing or something data intensive of that nature. You don't have the hotspot running do you? Have a look under cellular data usage in settings as I think it gives you a rough idea what is using your data.
My wife had put google photo backups on my phone and so far I have used 51.5 gigabytes of data to back them up and transfer lucky I have a good data plan but turning wifi on now.