Store phone number as the user entered it

It’s confusing to the user to have their phone number played back to them in
a format that they didn’t enter it. We’ve seen multiple times that people enter
0781… and then don’t recognise their own phone number when it’s played back as
+44781…

The API can handle phone numbers in any format as of
https://github.com/alphagov/notifications-api/pull/134

So there is no need to reformat the user’s phone number before storing it now.

app/main/forms.py

@@ -37,19 +37,10 @@ class UKMobileNumber(TelField):
 
     def pre_validate(self, form):
         try:
-            self.data = validate_phone_number(self.data)
+            validate_phone_number(self.data)
         except InvalidPhoneError as e:
             raise ValidationError(e.message)
 
-    def post_validate(self, form, validation_stopped):
-
-        if len(self.data) != 9:
-            return
-        # TODO implement in the render field method.
-        # API's require no spaces in the number
-        # self.data = '+44 7{} {} {}'.format(*re.findall('...', self.data))
-        self.data = format_phone_number(self.data)
-
 
 def mobile_number():
     return UKMobileNumber('Mobile phone number',