  This work proposes a novel approach to restricting the access for blacklisted
Android system API calls. Main feature of the suggested method introduced in
this paper is that it requires only rootless or (user-mode) access to the
system unlike previous works. For that reason this method is valuable for
end-users due to the possibility of project distribution via Play Market and it
does not require any phone system modifications and/or updates. This paper
explains the required background of Android OS necessary for understanding and
describes the method for modification Android application. In this paper the
proof-of-concept implementation. That is able to block the application's IMEI
requests is introduced. Also this paper lists unsuccessful methods that tried
to provide the user security. Obviously with those restrictions application may
lack some of features that can only be granted in unsecured environment.
