Wow, my Android OS used 1.75GB in 5 days I just purchased a samsung galaxy s2 from Virgin Mobile on the 7th of May 2013. Have it activated on the 8th of May 2013. Can anyone tell me why my Android OS would have used up 1.75 GB of data in that amount of time. Not to mention the slow data speeds I am  receiving I could barely download anything unless I waited a very long time and had very poor internet connections. was constantly getting webpage not available every time I used the Google search. Have had many conversations with virgin mobile to no avail. Can anyone help or at least explain to me what is happening here?
Phones always use more data than normal in the first day or so, particularly if you didn't connect it to wifi while it was being set up.

Things that happen in the first day will be checking for (and downloading and installing) OS updates (which can be large), downloading and installing new apps (some of which could be large), syncing data down from the cloud to apps for the first time, syncing data and apps down from backed up Android data to your device.

You might also want to see these previous questions for more info:


How to monitor the amount of data traffic?
Minimizing data usage for users with data caps