I know I'm like three generations behind, but I have an S8. In the last two months ONLY, my phone carrier has started sending me messages saying I'm using up my data. I only use wifi. I have mobile data turned off always because the data plan I was grandfathered into is like 50 MBs or something. When I check my mobile data in my phone, it says I've used 0 bytes. My phone company says that error reporting can use mobile data while it's turned off, but that seems like a lot of error messages with no images/sound (and I haven't seen any of these). Is there a way to turn off this extra data usage even though it's already turned off?