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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 ...

First, let me say that network data counting in Android is not so easy, because there is no API which provides this information in a clean way. The App developers have to work with some Linux internals and other issues. This is why most traffic counting Apps don't work on every hardware/software combination. For exaple I had an app that worked with Eclair ...

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 ...

Yes, there's an API for that (the class is android.net.TrafficStats). It was added with API level 8 (Android 2.2). As you can see below, it offers both Rx and Tx bytes in total, only accounting mobile or per app (added in API level 14, note that with an equal UID count as one). This is an excerpt, see the link below for all methods. static long ...

DroidStats does this for calls, SMS, and data: You can place widgets on your homescreen1 or, with the pro version, even inside your notification area2. Limits can of course be configured. It even shows data usage on a per-app basis. Statistics can show your most-called (and most-called-from) contacts, and more. As for data, 3G Watchdog even can go a ...

Some networks allow you to check how much you have used such as O2. If you have ICS or Jelly Bean there is a Data Usage listing in settings. Alternatively try apps like these http://www.theandroidsoul.com/best-android-data-usage-apps-for-monitoring-3g2gwi-fi-usage/

Assuming that you are using a Galaxy Ace with Android v2.3 (Gingerbread), I suggest you to use an application like 3G Watchdog or Onavo Count. But if you are using a Android phone with Android v4.0 (Ice Cream Sandwich) or higher there is a built-in option in settings menu called "Data Usage".

My Data Manager also does a great job. Tracks wifi and cellular down to the app level. You can have it warn you when you are near a data cap. You can set it up to track by calendar month or by your billing cycle. It has a widget as well as a notification bar item. I used it to track down my runaway data usage (Doggcatcher) on my phone as well as a ...

My Data Manager is a free app available in the android market which will aid you in catering your needs. It will give you a detailed statistics of which app/service used how much data. Edit : did not notice this was answered in the comments already.

As of now (unless someone can correct me) there is no APP that will monitor Sprint 4G WiMax data. Although, it can be found by calling information *4 from a Sprint phone and pressing 4 to hear details of the individual phone use. The 4G data will be listed, and can be sent in a text message to the phone (if desired) by pressing 2.

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 loose the WiFi connection, instead of switching automatically to 3G without you noticing..) There are plenty widgets ...

I couldn't find such a feature shipping with Android itself -- but: Yes, there is. Or rather: there are. Plenty. It would become a long list. Watch out on the Playstore for DroidStats or Call Meter 3G -- both apps allow you to specify the "payment day" (DroidStats is probably easier to use, while Call Meter can cover more complex scenarios). There are also ...

You are running CM10 in your phone. So its rooted. You can restrict Mobile data usage with some exceptions for specific apps by an app called Droidwall fro playstore. This app is seful to specify which apps can use Mobile data and which cannot.

After reading the comments, there's not much else to suggest for you to check on your phone. So, here's two free APPs to help you out: My Data Manager Main features:   • Simple to setup and simple to use.   • Know what apps are using data with automatic monitoring of your app data usage.   • Set usage alarms to avoid overage charges and ...

Take a look at DU Meter for Android. DU Meter can show current network transfer rates in the notification area, it includes a home screen widget which displays daily or monthly data usage, etc. Disclaimer: I'm the author of DU Meter.