I've noticed the same thing. My Uninstalled Apps currently shows 1.2mbs. It should still be 0 but, progress?13.4 seems to have slowed down my data usage. However, I am mostly on Wifi these days... so it's too early to celebrate.
I haven’t been monitoring this issue lately but I’m on iOS 13.5 and recently signed out then back in from iCloud. (For a difference reason) My ‘uninstalled apps usage’ is currently staying at 0.
Watch this. For one month because of using 13.7 IOS version cellular data was up to 354 GB! including mysterious uninstalled apps item! I have reported the following to apple within a chat (because there is no more email support) and they told me that was a problem with Telcel (my career network provider). But Telcel had told me that they are based on what the device reporta to them! So I Have been charged for 750 USD by Telcel only for this month! and all is Apple’s fault!:I just noticed this issue on my iPhone XR. I got a notification from my carrier that I’ve used 90% of my 8GB of data and I have 11 days left in my billing cycle. My data usage is usually around 4GB per month, so this was pretty strange. I noticed that System Services and Uninstalled apps we’re taking up the majority of my data usage. I Reset my statistics and am keeping a close eye on this now.
This seems to have started around the time I installed iOS 13.3.
Sounds like you may want to follow up with your carrier and/or Apple.So, I need from you a full refund of this ASAP before recurring third parties support. Also, me, all my employees, friends will stop using Iphones
I still see the "Uninstalled Apps" using some mobile data in iOS 14 from time-to-time. Not a lot, but it's still there.Funnily enough, I also noticed this over the past year on my device. However, after updating to ios 14, the category is gone completely. Maybe now the issue has been addressed.