NFC Lock/Unlock Programming language: Java. Source platform: Android 4.1 +. Development the modification of system dependencies Java codes which allow to gaining access for blocked device via NFC technologies with using standard method for blocking device. The source devices are : nexus s (android 4.1), nexus 7(android 4.2 multiuser), Motorola TC55 (android 4.1). If device has many users mode, our modification will allow to get access for different users with save they settings;