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I watch a lot of inspiration videos from TED (www.ted.com.au) on my new Galaxy S2 phone. However, I only do this when I am at home and can access my home wifi network.

My home wifi and the phone's 3G networks are with different providers. Obviously, my phone switches to the home wifi network automatically when I am at home.

My question: Is it possible for my 3G network provider to see/track my wifi usage and bill me accordingly (as if I am using the 3G network) because everything goes through the phone that is on their network?

I am new to smart phones so please bear with me. My monthly 3G data download allowance is only 150 MB but my home wifi came with 5 GB.

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In case you don't know, there's an official TED app in Play Store which would let you download videos for later viewing. –  Sachin Shekhar Oct 3 '12 at 18:50
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4 Answers

up vote 8 down vote accepted

Of course not. Your WiFi will go through your WiFi chip to AP and to some other ISP. There is no connection with 3G just like you can use WiFi even without SIM.

But your carrier can(though highly unlikely) use some tracking program to track you and find what you are doing. Even if they do, the WiFi usage won't be counted as 3G.

One advice I'd like to give you is sometimes you think you're on WiFi but due to many reasons you might not be connected to WiFi and you might be browsing over 3G. So just keep an eye for that.

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On Android, Wi-Fi is always used in preference to mobile data when connected to a Wi-Fi network.

This was quite clear in Gingerbread and older versions of Android, which removed the mobile data icon from the status bar when Wi-Fi was in use. From Honeycomb onward, the mobile data icon may remain on screen when Wi-Fi is active.

If your carrier/handset manufacturer hasn't customized the firmware too much, then (on ICS and later) the active data network will be blue, while the inactive data network will be white. (I don't have one handy, but I believe on the S2 they always appear in white, which is confusing. Still, Wi-Fi overrides mobile data.)

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See this question for someone else with a similar concern. He also has a Galaxy...

To be sure you are using only WiFi connection, you should specifically turn off the mobile data connection (in that case you will have no connection if you lose the WiFi connection, instead of switching automatically to mobile data connection without you noticing.)

There are plenty of widgets out there that can make it more convenient to turn on/off your data connection.

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Just flick your phone to flight mode, this stops the 3G from clicking over if your wifi falls off for whatever reason.

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Flight mode also kills WiFi. –  Chinmay Kanchi Oct 3 '12 at 16:24
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@ChinmayKanchi: You can enable Wi-Fi while in airplane mode (at least, you should be able to), it just may disable itself automatically when you first enter airplane mode: android.stackexchange.com/questions/27739/… –  eldarerathis Oct 3 '12 at 18:21
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This was news to me! I'm surprised, since none of my older phones (Nokia S40/S60) allowed this. However, I stand by my downvote, as the OP will be unable to make or receive phone calls while in flight mode. –  Chinmay Kanchi Oct 4 '12 at 14:46
    
As @ChinmayKanchi also noted, you will be unable to make or receive phone calls while in flight mode. This is a big disadvantage as normally this is the primary usage for a mobile phone... –  awe May 15 '13 at 11:52
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