Supercheckout module

[Iadrian2]

Hi, i installed Supercheckout module

 

In my country our phone number has 10 digits. Some customer input a shorter , or longer number, and this is frustrating. Sometimes the customer checks his e-mail once every 2-3 days, and i need him to confirm the order as soon as possible. So my question is : How can i make the phone number field ask for a 10 digits number, not a minimum number or maximum number but just 10 digits. I'm still a noob at this, so i will really appreciate your help