MODIFY_PHONE_STATE is a system-only permission, so apps are not allowed to get it.
This may have changed from previous versions of the platform, but that is okay because it is only protecting private APIs, so if you are doing something that requires it, you are using private APIs that are not supported and will result in things like your app breaking on different builds of the platform.
The stack crawl you include is not complete, so there is no way to tell what you are actually doing.
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