NSN length: 8 (landline) or 10 (mobile) Access codes; Country code: 234: International access: 009: and may vary within the area code. Mobile phone numbers start
The user may alternatively write +919999999999, where +91 is country code (+91 for India, but can accept any other like +110 or +52), or he may also write 09999999999 (first 0 for own country) Here, the user have 3 choices, adding the mobile number with country code. simply without country code or 0 prefixed. With a zero prefixed in mobile number.
The accepted answer doesn't work with numbers without '+' sign. And I did a little math following the Wikipedia metrics, Country Code : 1 to 3 digits, maximum : 15, Actual Phone Number : 12 (upon 15-3) to 14 (15-1) digits. The minimum in this regard is 10. For instance, the dummy US number "+14155552671" is the bare minimum.
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