Java.lang.SecurityException: neither user 10032 nor the current process has android.permission.MODIFY_PHONE_STATE

I start the automatic PIN / PUK service when the device starts. The service starts at boot time. I am using ITelephony with reflective methods. My phone is lollipop 5.1.1, this is root 5. My Android Studio manifest says "Permission is granted to system apps only"

I am using this piece of code:

    TelephonyManager tm = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
        int state = tm.getSimState();

        if(state == TelephonyManager.SIM_STATE_PIN_REQUIRED || state == TelephonyManager.SIM_STATE_PUK_REQUIRED)
        {
            Log.d(TAG,"PIN PUK STATE = " + state );


            if (state  == TelephonyManager.SIM_STATE_PIN_REQUIRED ){
                try {
                    message += ", PIN Code required" ;
                    Class clazz = Class.forName(tm.getClass().getName());
                    if (clazz != null) {
                        Method m = clazz.getDeclaredMethod("getITelephony");
                        m.setAccessible(true);
                        Object iTelephony = m.invoke(tm);

                        Class params[] = new Class[1];
                        params[0] = String.class;

                        Method m2 = iTelephony.getClass().getDeclaredMethod("supplyPin", params);
                        m2.setAccessible(true);

                        Object i = m2.invoke(iTelephony, "1111");

                        Log.d(TAG, m2.toString() + " *** " + i.toString());
                    }
                }catch (Exception e) {
                    Log.d(TAG,"Impossible to unlock " + e.toString());
                    e.printStackTrace();

                }
            }

      

        
        
        
      

    

And I get this log:

07-20 10:31:33.109    1267-1267/eu.cabrera.pinunlocker W/System.err﹕ Caused by: java.lang.SecurityException: Neither user 10032 nor current process has android.permission.MODIFY_PHONE_STATE.
07-20 10:31:33.112    1267-1267/eu.cabrera.pinunlocker W/System.err﹕ at android.os.Parcel.readException(Parcel.java:1546)
07-20 10:31:33.112    1267-1267/eu.cabrera.pinunlocker W/System.err﹕ at android.os.Parcel.readException(Parcel.java:1499)
07-20 10:31:33.112    1267-1267/eu.cabrera.pinunlocker W/System.err﹕ at com.android.internal.telephony.ITelephony$Stub$Proxy.supplyPin(ITelephony.java:1540)

      

        
        
        
      

    

I tested with a regular app and now with a system app, same problem.

Am I doing something bad? Is my application really a system? I copied eu.cabrera.pinunlocker.apk to/system/app

What do I need to give my app android.permission.MODIFY_PHONE_STATE?

Thank you for your help. Antoine