Clash of Clans - Data usage

The Clash of Clans game doesn't have options to limit data usage per se. For most users this isn't a big deal because they have wifi for when at home and cellular data plans that start at 1GB of free data so game designers would have little reason to worry about such features.

That being said, some things you could try:

• In the CoC settings there is an option to connect with Facebook. Consider turning this off if he is connected as CoC may periodically download data from Facebook in the background.
• Avoid doing things in the game that may consume data but are unnecessary such as:
  • Playing and sharing replays of attacks
  • Conversing on global chat
  • Logging into the game just to tap on your collectors when you have a shield. Every time you wake up the game and see that loading bar it is syncing data with the servers. If you fire up the game just to tap on your collectors when you could wait longer to do so you are using up a little bit of extra data.
  • Similarly if you log into the game every time it sends a notification you've been attacked or an upgrade finished etc, but you don't really need to, you are use up a little extra data.
  • Searching too long for an opponent to attack. Each time a new potential opponent loads, data is being sent/received. If he is, for example, looking for a TH to snipe (which is a pointless activity), that's wasting data.

That all being said, all of this probably doesn't amount to much data savings. Whenever Supercell releases an update to the game that needs to be downloaded, that involves a lot of data transfer and there was recently a Halloween update as well as the Wizard update that contained some videos that probably ate up a lot of data.

You might also want to confirm the data usage is coming from CoC. I play the game more then I should and looking at my cellular data stats CoC only used 94 MB while Facebook took in 1.2 GB. Just make sure you aren't chasing a red herring.