![background image](http://html.mh-extra.com/html/samsung/sm-j400f/sm-j400f_user-manual_1192088003.webp)
Table of Contents
3
109 Introduction
109 Connections
110 Wi-Fi
112 Bluetooth
114 Data saver
115 Mobile Hotspot and Tethering
116 SIM card manager (dual SIM
119 Dolby Atmos (surround sound)
121 Blue light filter
121 Changing the screen mode or
123 Wallpapers and themes
124 Advanced features
126 Device maintenance
128 Apps
128 Lock screen
129 Security
137 Google
137 Accessibility
138 General management
139 Software update
140 User manual
140 About phone