Here is a list of the common Divi Builder breakpoints for different mobile devices. These can obviously change based on the child theme you are using. Be sure to review the style.css file to find your Divi breakpoints.
Common Divi Builder Breakpoints for Devices
479px and lower: for mobile
480px – 767px: for mobile
768px – 980px: for portrait tablets
981px – 1100px: for landscape tablets
1101px – 1405px: for desktops
1405px and above: for large desktops