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/Applications/FieldTest.app/FieldTest
NOTE
Field Test is not enabled by default in iOS 4.1
The Workaround is to play with DMG file of iOS 3.1.2 of the same device
- extract Field Test app and copy to your jailbroken iOS 4.1
- copy FieldTest.app from var/stash/Applications of 3.1.2 to var/stash/Applications of iOS4
- copy fieldtest.plist, fieldtest68.plist and specialkeys.plist from /System/Library/PrivateFrameworks/CoreTelephony.framwork/Support to /System/Library/Frameworks/CoreTelephony.framwork/Support of the iDevice
In this way you will have full access to field test application along with all possible options
Summary
This is the actual executable for Field Test