I was told that I used about three gigs in less than a day. I was using a internet connection all that day except a ten minute period where I used data to stream live video from
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Well there is a possibility that your phone did drop from wireless and was using pure cellular data instead if the wireless signal dropped too low. It may not have even alerted you to this as my phone never has.
Many phones will only use cellular data when the screen is off to save battery life. Some android devices will allow you to change your wifi battery usage setting to be always on so it does not do this.
So even if wifi signal strength is perfect the default setting of most modern phones will still use cellular data in your house when the screen is off for downloading email and notifications in the background.
Don't totally rely on the information provided by Telus My Account! My account shows 20Mb more than I actually used. The reason why I can tell is my BlackBerry Passport has a built-in Device Monitor (comes with BB10 OS) where I can monitor which app consumes how much data with detailed line graphs showing the time and date I used for "Mobile Data" and "Wi-Fi data". I can also set mobile data limit to be notified when data usage reaches certain amount within monthly data usage cycle. I believe most of Android smartphones have something like this.
@RickyTang1007 You're right - some operating systems have a built-in data manager that gives you a rough idea about how much data is used.
Most, if not all, do have a disclaimer indicating that data accounting on the device will differ from the carrier, though. Nevertheless, I think Android has the best implementation of on-device data management given the thresholds and auto-shut off feature you can customize.