Counter Mode Cipher Block Chaining Message Authentication Code Protocol (Counter Mode CBC-MAC Protocol) or CCM mode Protocol (CCMP) is an encryption protocol designed for Wireless LAN products that implements the standards of the IEEE 802.11i amendment to the original IEEE 802.11 standard. CCMP is an enhanced data cryptographic encapsulation mechanism designed for data. Checking your usage on a Mac 1. To track usage on a Mac, we're going to use the free app SurplusMeter. As the app only monitors data on that particular Mac, you'll have to install it.

Turn cellular data on or off

To turn cellular data on or off, go to Settings and then tap Cellular or Mobile Data. If you're using an iPad, you may see Settings > Cellular Data. If you're using a Dual SIM iPhone, you will need to set one of your plans as the primary data number in order to see how much cellular data you've used.

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Depending on your carrier and device, you may have additional options listed under Cellular Data Options:

• Enable LTE, 4G or 3G. You can select what type of network connection to use for voice and data. Learn more about these options.
• Turn Voice Roaming on or off: With CDMA networks, you can turn off Voice Roaming to avoid charges from using other carrier's networks.
• Turn Data Roaming on or off: When you're travelling internationally, you can turn off data roaming to avoid roaming charges. If you have an international data plan, you may need to keep data roaming on. Learn more about travelling internationally with your iPhone or iPad.

Depending on your carrier, data roaming may be used if you travel domestically. Contact your carrier for more information about your data roaming policy or other cellular data settings. You can turn cellular data on or off to limit apps and services from using the mobile network to connect to the Internet. When cellular data is on, apps and services use your cellular connection when Wi-Fi isn't available. As a result, you may be charged for using certain features and services with cellular data. Contact your carrier for more information about possible charges.

View how much data you're using

To see how much cellular data you've used, go to Settings > Cellular or Settings > Mobile Data. If you're using an iPad, you may see Settings > Cellular Data instead.

Scroll down to find out which apps are using cellular data. If you don't want an app to use cellular data, you can turn cellular data off for that app. When cellular data is turned off, apps will only use Wi-Fi for data services.

To see the cellular data usage for individual System Services, go to Settings > Cellular or Settings > Mobile Data. Then scroll to the bottom of the screen and tap System Services. Cellular data can't be turned on or off for individual System Services.

You can view the data usage statistics for an app from a current period, or app data statistics for apps that used data when you were roaming. To reset these statistics, go to Settings > Cellular or Settings > Mobile Data, and tap Reset Statistics.

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• If you still can't connect to a mobile network, learn what to do.
• If you use an Exchange ActiveSync account, it may continue to use cellular data even if you have turned it off for Mail and Calendar. To see the cellular data usage of your Exchange ActiveSync account, go to Settings > Cellular > System Services.
• If activated, Wi-Fi Assist automatically switches to use cellular data when Wi-Fi connectivity is poor. Wi-Fi Assist is on by default. This may result in additional cellular data use, which could incur additional charges depending on your data plan. You can turn off Wi-Fi Assist in Settings. For more information, see About Wi-Fi Assist.