I am trying to register for an exam in certification portal where I have to put area code for registration but in India we don't have any area code for our mobile number it is just like +91(country code) followed by our 10 digit phone number like +91 84xxxxxxxx no area code. If I am putting 0 on my area code it still gets reflected on final payments page as +91 084xxxxxxx which is wrong so what is it's solution?