Mine doesn't, either.
I keep my WiFi off, though, until I need to use it, and that's mostly for updating the apps on the phone. LOL. I update my apps about once every two weeks.
I wouldn't expect the techs to recognize the leakage on the phones as this is fairly recent thing that I found on my own discovery.
Regarding the rest:
1. Streaming anything is going to eat a lot of data, especially if you run HD, which will not only eat your data, but impacts more than just you. We don't stream movies/TV, so not an issue for us. On occasion I will stream a match on TuneIn or listen to Spotify if I'm outside, but always at a very low streaming rate and usually for not more than 2 hours. I have no idea about Apple Music's streaming rate, but I'll bet it's not healthy for your data budget.
2. We realized the issue with DirecTV boxes, which uses a lot of data for more than just On Demand programming. It uses it for the guide, for firmware updates, for on-screen apps, for that "start from the beginning" thing (which is essentially On Demand)... This is noted in many places elsewhere on this site. We disconnected our boxes from wifi a couple of years ago because of that.
Guarantee if you heavily engage in any of these activities you're going to run through data like crazy, not just the phone thing, which is what this thread was meant to alert for.
If you download a lot of music, recommend you get up before 8am (Bonus time) and do it then. That's when I do all my major updates manually as well (I have automatic updates turned off everywhere). This incudes: All phone/ipad apps, podcasts, App store updates, MacUpdate and Homebrew updates; as well as updates for Fedora and Win10 running in a Parallels VM. With 50GB per day in Bonus time, you should be able to average ~1.7GB each day without running out.
Edit: I would also not recommend using the free wifi in stores... well, not unless you'd prefer your Apple Pay (or other) to be hacked. I've been burned by getting passwords stolen twice by free wifi - once in an airport, once in a hotel. Never again.
Worthwhile to point out that this is completely unrelated to another possible leakage issue that deals with wifi on iPhones as well as other devices. That problem has to do with using a device when there exists a marginal wifi signal.
In those instances the lack of a good wifi signal (as indicated by less than 3 curved bars) may cause packet errors, resulting in possible packet resends, therefore using more of your bandwidth than is necessary.
If in doubt, the HughesNet phone app has a built-in wifi checker. It can tell you if the signal will support a virtually error-free experience as such:
I've been fighting with Hughesnet for 2 weeks now and this is the first real hope of resolving this problem. Thanks I'll let you know if it works for us. Exactly the same thing and the new update knocked out my FB app completely on my iPhone, can't use it at all have to go to Facebook.com for my viewing pleasure. Didn't affect my husbands phone yet since he didn't update with the 11.4.1. Maybe this will help.
No need to fight with anyone. If it's an Apple problem (and it wasn't known by anyone, I just happened to stumble upon it) I wouldn't expect HughesNet to be responsible.
So I did this. It seemed to work, kinda, but then I went on to explore something else. I recorded my mb usage every time I logged in and out of just my computer. Never turned on my phone. There is something going on with either Hughesnet or Facebook. I can get on any website or app e.g. my banking and only use a few mb of data. Log into Facebook for 10 mins, just scrolling, not stopping to watch any videos, just scrolling and I've used a half of a gigabyte. Most of the population and before the middle of June I was able to scroll, interact and find new sites on FB but since then it eats my data. I'm at a loss and want to dump this stupid Hughesnet since I can't get through to corporate to make any sense of anything.
You are assuming the problem is with the ISP, when it is quite likely the problem is something that has changed in your network, something that has changed at Facebook, or something else. Without you working on your end to troubleshoot your system, it is unlikely you will be able to figure this out. The ISP can only verify some things on their side, but you need to also work on your side to find what is eating your data. There are plenty of posts here on how to do this, and there is software (Glasswire, for instance) that can help you figure out and fix what is going on. The ISP can't wave a wand and fix your side of the network for you, or fix the Internet for you -- you have to do some of the work, sometimes most of the work. If you can't hack it, if doing the troubleshooting is too much for your temperament, then you always have the choice of cancelling your account.
*I am not a Hughesnet employee or representative. This is a customer-to-customer tech support community, and I am a customer.
I said this was a new-ish thing that I noticed, not the only thing. IOW: Something that should be added to the list of things to check for leaks (which is actually a whole other thread that someone took a lot of time to produce).
That said, Facebook is the worst when it comes to keeping settings that you thought you had set, but are no longer set that way. Why? Who knows... I personally think Facebook is the most evil of all social media platforms, but that's just my personal opinion. They've done nothing to eradicate all the fake accounts that crop up, as far as I can tell from the embarrassing avitars of those "I might already know". Hint: You don't want to know, and I certainly don't. I keep deleting them but they keep coming back.
That said, you might want to consider using an ad blocker like Adblock Plus so all their tracking goes in the bin. You might also want to check to see if their automatic video display is disabled and mute everyone that displays lot of pictures. Lord knows what resolution those pictures are and it could be draining a lot of MB right there.
Having said all this, it's presumptuous of me to think that Facebook would be the only leakage problem and checking everything is the best advice.
If your computer is Windows based, you should consider installing Glasswire, which will monitor the data usage of the Windows based computer it's installed on. It's free, and not at all intrusive, nor resource hungry. The "firewall" description you will see on their webpage concerns a more thorough set of adjustments for your built in Windows Firewall that Glasswire gives you, but you don't have to use that part of it, and simply installing Glasswire doesn't change anything about your Windows Firewall.
Glasswire is a great tool to have, and many of us use it. It can't tell you about your past data usage, but it can monitor your data usage going forward, so if whatever was happening with your computer, data wise, happens again, you'll be able to see just what used the data.