Parsing exception in Phone Number library in python

I am having Mobile numbers in below format with no "+" sign in front of mobile numbers. How to get country from these format of numbers. I checked documentation,"+" sign is required. Any way to add '+' sign manually before it check for number to avoid parsing exception.

Mobile_Number: 9687655xxxx
Mobile_Number: 6142499xxxx
Mobile_Number: 20109811xxxx

py script-

import phonenumbers
from phonenumbers import geocoder

query = phonenumbers.parse("96650072xxxx", None)
print (geocoder.description_for_number(query, "en"))
print(query.country_code)

Error-

<>@ubuntu:~/elk$ python3 a.py
Traceback (most recent call last):
  File "a.py", line 4, in <module>
    query = phonenumbers.parse("96650072xxxx", None)
  File "/home/<>/.local/lib/python3.6/site-packages/phonenumbers/phonenumberutil.py", line 2855, in parse
    "Missing or invalid default region.")
phonenumbers.phonenumberutil.NumberParseException: (0) Missing or invalid default region.

Output after adding '+' sign

<>@ubuntu:~/<..>$ python3 a.py
Saudi Arabia
966

Ref link- https://pypi.org/project/phonenumbers/

If your source dataset is just missing the leading + you can just add it in the parse call.

original_phonenumber = "96650072xxxx"
query = phonenumbers.parse(f"+{original_phonenumber}")

If you have a mixed dataset, you need to check first if your phonenumber actually starts with +

original_phonenumber = "96650072xxxx"
if not original_phonenumber.startswith("+"):
    original_phonenumber = f"+{original_phonenumber}"
query = phonenumbers.parse(original_phonenumber)

But that's bad practice, so I would instead advise you to fix your source dataset. Are you sure that only the leading + is missing and not the entire country code?