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This article discusses software internally used by Apple.

Acquiring a copy without Apple's consent is illegal and may result in being scammed.
Engaging in illegal activity is not condoned. This information is provided for educational purposes only.

E911Tester is an internal app used for testing the implementation of Enhanced 911 (also recognized as E-911 or E911) service in North America. It is included in almost all Carrier Firmwares.