This excerpt from the ebook, A Practical Guide to Networking and Security in iOS 8, offers a variety of advice on keeping your cellular data usage down.

Choosing the right size data plan will let you use your phone to its fullest, without overpaying for a plan you don’t use or expensive overages. Here’s how to size up your usage.

Understanding how much data your favorite apps use, and how to track and adjust that usage, can help you avoid costly overage or painfully slow speeds, depending on your carrier.

Kurt "CyberGuy" Knutsson explains what the difference is between using cellular data or a WiFi network and shows you which is most secure.

Calculating how much data you need can be a bit of a minefield, so here we look at how internet data works and how to assess how much data you really need.

Once the data is consolidated, you can view wireless usage and costs by department, individual, or even service type (i.e., cellular, paging, etc.). Color-coded views let you spot trends or ...

See how much data Spotify, YouTube and other popular apps use and learn how to track your own data usage. Then, find the best smartphone plan for you.

If you have limited cellular data on your cell phone plan, there's an easy way to check and manage your data usage on an iPhone. With certain carriers, you'll have to reset your "Current Period ...

For a very short period. Within a just a few short seconds of activation there are small packets of 10 KB data being sent. Left active, these packets are sent regularly.