Download and install Good Lock app in any samsung phone in any country officially
Samsung Good Lock is the official best app for customization of your Samsung phones. But unfortunately it's not widely available in all countries.Theme Park (Beautiful themes for your phone)
Pentastic (For S Pen)
Wonderland (Beautiful and 3D interactive wallpapers)
Keys Cafe (Change the look of your samsung keyboard and make it really amazing and wonderful)
Clock Faces (Change your lock screen clock and styles and attractive clock faces for Always on display)
These modules are free and officially from Samsung and it makes the look of your phone stunning.
Here is the easy way to get good lock app from Galaxy App Store whether it's available in your region or not.
Instruction to install Good Lock App from Galaxy Store