Data usage is getting costly when my phone is ONLY on wifi? How is this possible?

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So, I noticed every month recently I am getting apparent data usage which is getting quite costly, so i decided to test this and leave my phone at home, my data usage is still accumulating. I ONLY use wifi so how is this possible?
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Missy Brett

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Posted 2 years ago

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Goran, Mobile Master

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Are you using an iPhone? It has a feature called wi-fi assist where it will use cellular data if the wi-fi signal isn't strong enough. Check out settings and cellular to see that it's off. Otherwise and overall also make sure that data is turned off then when you're not in wi-fi as background processes could also be taking up data
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Missy Brett

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It is a Samsung LGG4.  I have had this phone for a while and the last 2 or 3 months this is happening.  My wifi is on, which is all I had to do before.

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rikkster, Mobile Master

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Which phone do you have, Missy? Samsung and LG are two different brands of phone.

Newer Samsung devices have a similar feature called Download Booster which uses Wi-Fi and LTE networks at the same time to speed up the download of large files. The difference is that unlike iPhones' Wi-Fi Assist, where the feature is on by default, Samsung's Download Booster is not and has to be enabled manually.

If you have a Samsung device, check to see if Download Booster may have been enabled inadvertently. Go to Settings > More connection settings - Download Booster should show as 'off'.

If it's an LG G4, make sure mobile data is disabled. If you've ever had to factory reset your LG G4, mobile data may have automatically re-enabled itself.
(Edited)
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Bernard, Official Rep

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All smartphones use data in the background as Goran said. Sometimes to sync with your email accounts and social networking accounts to see if there is new mail or status updates, things of that nature. Unless you disable your data connection there is a chance that applications are using data in the background. You can also change in the settings that your apps only update in wi-fi. If your wi-fi connection becomes weak and data is on, your phone will seek a stronger connection which will be our network. 
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Dennis, Mobile Master

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Also Settings>Wifi>More>Advanced

Here should be options to keep wifi on when your phone is asleep.  Otherwise, even if you are within a wifi area, the phone will turn off wifi on it's own when it is asleep to save power
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Missy Brett

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I do understand all that but as I said I have had this phone for awhile and this has only been the past couple of months.  I have even started shutting my phone completely off when at work and even at home.  Something is definitely wrong.
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Bernard, Official Rep

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Looked at your bills all the way back to January. It seems you had data overages every second month or so even back then. Here is what I suggest to lower your bill by a lot and avoid overages. We have introduced shock-free-data plans where your data would be blocked/paused once you reach your allotted monthly amount. You are on a $39 plan with 600mb. We have a promo right now where $50 would get 2gb of shock-free-data. This could save you $50-100 compared to what you are spending now. You can change plans for free online, just log into your account.

I don't think your LG G4 is at fault. If you completely shut off your phone no data would be used. That said a factory reset might be useful, just remember to save all your info before you do that.  
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Missy Brett

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ok, thanks I will look into that.  Like I said I have been turning my phone off when at work and home but when I turn my phone back on not much longer after that it tells me that I have over spent on my data. Sorry, but it just doesn't make sense to me.
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David, Mobile Master

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Turning your phone off does not remove Applications demand for data, it just postpones it to when you turn on again. The suggestions above to assess what Apps are consuming data, and adjust them is the wisest. Buying a larger data plan is cheap insurance against overages.
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Dennis, Mobile Master

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It takes time to connect to the Wifi network sometimes.  Data could be used during the reboot period.  Have you tried turning data off in your settings when you dont need to use it?  FYI data off means the pipeline to receive free picture messaging will be off too
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rikkster, Mobile Master

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@Missy. If you decide to perform a factory reset on your phone, keep in mind mobile data will automatically re-enable itself. After the phone resets, it will prompt you to connect to your Wi-Fi network. Once connected to Wi-Fi, you can skip past the setup phase and go to Settings > Data (or Data usage) to turn off mobile data.