What are the major international numbering plans ?

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Telephone numbering plans are the structured systems that dictate how phone numbers are assigned, formatted, and managed within a particular telecommunications network, whether national or international. The goal of these plans is to ensure every communication endpoint has a unique and routable address. While each country has its own national numbering plan, these plans generally adhere to broader international standards to enable global communication.

The major international numbering plan is:

E.164 (The International Public Telecommunication Numbering Plan)
This is the most crucial and widely adopted international numbering standard, defined by the International Telecommunication Union (ITU). It serves as the overarching framework for global bangladesh number database telephone numbering, ensuring that calls can be routed seamlessly between different countries and networks.

Key characteristics of E.164:

Global Uniqueness: The primary aim of E.164 is to ensure that every telephone number in the world is unique, allowing for correct routing of calls and SMS messages.
Maximum 15 Digits: An E.164 compliant international phone number has a maximum length of 15 digits. This limit helps maintain efficiency in routing and system design.
Structure: The E.164 format generally consists of:
Country Code (CC): One to three digits that uniquely identify a country or a group of countries (e.g., +1 for the North American Numbering Plan countries, +44 for the UK, +880 for Bangladesh).
National Destination Code (NDC) / Area Code: This follows the country code and routes the call to a specific geographic area or mobile network within that country. Its length varies by national numbering plan.
Subscriber Number (SN): The final digits that uniquely identify the individual telephone line or mobile device within the area or network defined by the NDC.
Use of the '+' Sign: When presenting an E.164 number, it is conventionally prefixed with a '+' sign (e.g., +8801712345678). This '+' is a universal indicator that the following digits form a complete international telephone number and should be preceded by the appropriate international access code for the country from which the call is being made (e.g., '00' in most of Europe, '011' in North America). Mobile phones and many VoIP systems automatically handle this translation.
Flexibility (Open Numbering Plan): E.164 is an "open numbering plan," meaning the number of digits after the country code can vary depending on the national numbering plan.
Major Regional/Integrated Numbering Plans operating under E.164:
While E.164 is the global standard, several large regions operate their own integrated numbering plans that share a single country code, making them appear