fix phone mask bug

src/routes/selfRegister/components/SignUp.js

@@ -99,10 +99,6 @@ class SignUp extends React.Component {
 
   handlePhone = (event) => {
     let phone = event.target.value;
-    if (phone.indexOf("+1") < 0 && phone.length == 10) {
-      phone = "+1" + phone;
-      phone = phone.substring(0, 12);
-    }
 
     this.setState(Object.assign(this.state, { phone_number: phone }));
   };