Easy validation for contact number/mobile number

djangoContactNumberValidation.py

valid_contact = True

# Check if contact can be converted to integer (use regex match if chars like + are allowed)
# Although it is suggested to store coutry codes separately
try:
    contact_number = int(data['contact_number'])
except ValueError:
    valid_contact = False

# Change length according to needs, generally kept between 10 and 15, strictly 10 used here
if len(data['contact_number']) != 10 or not valid_contact:
    return Response({"status": "error", "message": "Provided contact number is invalid. Only 10 digits are allowed."})