There's no official app.. but you can use safely some apps without worrying.. 1. Network Speed - Internet Speed Meter - indicator... (Samsung app store) 2. Internet speed metre (play store) which is very useful.
As per your query, we want to inform you that all devices have different and specific features depending on the hardware and software, and as of now, for checking the internet speed there is no specific application available in the Samsung Galaxy app. We have noted your feedback regarding the same and we are continuously working to make our products better and more efficient.
