Hi, thank you for your prompt response! since the form created for the company's internal use only, so it should have to be 10 digit numbers that I did not even think about adding a country code or something, etc...:-)
Below is a calculate value that I have been searching for from google but I am not sure if it works or do I have to use any rule/condition? Any advices? I really appreciate it.
concat("(", substring(translate(., "()-", ""), 1, 3), ")", substring(translate(., "()-", ""), 4, 3), "-", substring(translate(., "()-", ""), 7, 4))