<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _deserialize(self, value, attr, data):
 """Format and validate the phone number using libphonenumber."""

        if value:
            value = self._format_phone_number(value, attr)

        return super(PhoneNumberField, self)._deserialize(value, attr, data)