Fat chick2014 wrote:
Is there a way to find out what sites were visited for the data usage?
Not without using a third party utility. For iOS (iPhone, iPad, etc.) there are ones out there that use their web site as a proxy server so all of your internet traffic goes through their site. Since it all goes through their site, they can then track your app data usage, etc. The standard tools included in a new phone purchase don't have this capability though.