Hello. Prompt the instruction in your subject zara entering the phone by mask for example +7 (999) 999-99-99 ? Thanks in advance. Sorry for my bad english

@Michael
Take a look on HTML5 patterns:
https://www.w3schools.com/tags/att_input_pattern.asp

I am not sure if you will be able to do exactly what you want, that might require jquery to be checking what was entered and show something like placeholder +(___) ___ ___