My provider gives my 3GB of data and I don't know how to find out how much I have used or have left. Where can I find this information
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".
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1Data usage was there in 2.2 as well, are you sure its not there in 2.3 ? Moreover these are not really reliable, it will even account your wi fi usage. Best way is to check with service provider, am sure they have a USSD code or something. – GoodSp33d May 2 '13 at 14:03
3G Watchdog keeps separate totals for Wi-Fi and 3G data use, so there should be no confusion about whether it is from the mobile network allowance (3G data) or some wi-fi hotspot. The watchdog can also be set to disable your 3G connection at some level (eg 80%) before you hit your limit.
AVG (antivirus) now includes a data usage monitor, but just warns and does not disable, as far as I know. If I had a limit, I'd prefer to have the connection broken in case I started a high traffic application (eg world wide webcam) and might be charged for traffic above my allowance (network I used in 2012 charged around 100 GBP / US$ 150 per extra GB of data, something to avoid!).