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Mobile data used even when connected to wifi

I have a 500MB tariff with virgin which went way over last billing cycle for the first time ever.

I checked my bill and every night there are three or four 'using the internet' charges which are always 8KB or 9KB each. The phone is connected to my home wifi at the time which I've checked and it works fine. So what could be using mobile data during the night when it could use wifi?

I installed a data monitor on the phone and that says 0B of mobile data used during the night.

The phone is a nexus 4 with the latest Android installed. Any ideas? Thanks.

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Re: Mobile data used even when connected to wifi

The few KB taken just after midnight is easy to explain.

Your phone uses data all the time, bits here and there, it's not a lot but it happens. If you are connected to a wifi router, your phone will use that by default, but otherwise it will use your mobile data.If you've seen a big chunk of data disappear, it's likely your phone has been downloading an update to its operating system, or your offline satnav has been updating its map, or a whole bunch of apps have been given permission to update themselves whenever they feel like it.

The only way to stop this is to turn mobile data off.

Any mobile data that you use in any given day is rolled up into one total that's added to your account at some time after midnight.

Data gets used even when your phone is in standby Some phones will disable wifi after a short time in standby just to save battery. If mobile data is on, they will use that instead, otherwise they will tend to just wait 'til there's a data connection.

This all means you can have data taken off your allowance a) even if you aren't using the internet yourself and b) even when you think it should be coming from somewhere other than your limited and/or chargeable mobile data.

When you exceed your data allowance, any usage of the internet is charged at £1 per day or £1 per 100MB depending on your tariff. This includes the background data your phone uses by itself.

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