/ Creating mask for a phone number is simple. The only required knowledge is the pattern mask expression with fixed characters . Read more about it in "Mask expression" section.
This page demonstrates some examples for different countries.
 The following example demonstrates a more complex mask. It shows how to make the country prefix non-removable. It is achieved by built-in postprocessor from @maskito/kit . 
Read more about it in "With prefix" section.