David & David reveal 13 secret codes that will help you unlock hidden features on your iPhone. They can even help you find out if your phone is being tracked!

0. Introduction [0:00]
1. Field test mode [0:14]
2. Better call quality [1:37]
3. Call forwarding [2:24]
4. Network operator customer support [3:45]
5. Make anonymous calls [3:58]
6. Call tracking [5:24]
7. Fraud blocking [6:09]
8. Nationwide wireless priority service [6:56]
9. Check your phone's IMEI [8:01]
10. Legal and regulatory settings of the iPhone [8:31]
11. Call Waiting [8:51]
12. Prevent outgoing calls [9:16]
13. Anonymous call rejection [10:17]

Note: Depending on your phone model and carrier, some codes may not work.

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