IPhone 5 using 3g when locked?

I was viewing a webpage and did not press the home key before I locked my phone. Then a couple hours later when I went to check my phone, the webpage opened automatically. Was my phone connected to 3g that whole time? In other words, was it using up my data allowance while locked?

The clearest answer is "it depends".

Simply having your phone locked does not prevent data usage- many applications run in the background and sync data, or receive data on certain events (like a new email).

For the web page itself, this is just stored locally and pulled back up when you go back onto the browser, and generally won't use data… Unless there's something on the page that continues to refresh (like ads that change every 30 seconds or Facebook's news ticker).

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