android dumpsys permission denial

Question

I have an application where I create a process and call the dumpsys telephony.registry command to get information about the mobile network status.

Answer 1

Why does android OS still deny me access to the dump service ?

Because that permission is flagged as android:protectionLevel="signature|system|development" (or signatureOrSystem using the old syntax) on Android 2.3+, and therefore cannot be held by ordinary Android SDK applications.