Device

iStat can view your iPhone’s stats for battery, memory, disk space, WiFi and Cell IP addresses, uptime and load averages.

Battery

The battery section shows your battery level and the approximate time left for various activities.

Memory

The Memory section shows detailed information about memory usage. For more information on the meaning of active, inactive, wired and used, please read our iStat terminology document.

Disk space

The disk section shows how much free space your iPhone has as a bar graph and megabyte or gigabyte figure.

WiFi IP address

This is the IP address allocated for your iPhone’s WiFi networking. Please read this wikipedia entry for more information on IP addresses.

Cell IP address

This is the IP address allocated for your iPhone’s Cell networking. This includes 3G, Edge and GPRS activity. Please read this wikipedia entry for more information on IP addresses.

Uptime

This is the length of time your iPhone has been on since the last restart. Please read this wikipedia entry for more information on uptime.

Load averages

The values found under the “load” section measure the average system load during the last one, five, and fifteen minute periods. Please read this wikipedia entry for more information on load averages.

Unique Identifier

This 40 digit number is your iPhone’s unique identifier—a number that represents your specific iPhone. Your Unique Identifier is used for "ad-hoc" distribution of iPhone apps. This is a common method for developers to give out a limited number of their app for beta testing.

To copy your Unique Identifier to the clipboard, tap the Copy ID button. To email your Unique Identifier and your MAC address, tap the Copy Both button.

MAC address

This 12 digit number is your iPhone’s quasi-unique network ID. Please read this wikipedia entry for more information on MAC addresses.

To copy your MAC address to the clipboard, tap the Copy MAC button. To copy your Unique Identifier and your MAC address, tap the Copy Both button.