Back in 1995, the first mobile phone call in India happened between Kolkata and New Delhi. Fast forward 2 decades later, and thanks to mobile phones, we can now easily chat with people worldwide in just seconds. The magic behind this global connection is made possible by improvements in connectivity, all thanks to those tiny SIM cards in our mobile phones.
How SIM Cards Work?:
SIM cards, those little chips in our phones, are like personalized keys to the mobile world. Here’s how they make our phones tick:
- ID and Connection: Your SIM card has your mobile number and info.
- Storing Stuff: SIM cards keep your contacts, messages, and some network info safe.
- Security First: They use secret codes to keep your calls and messages private.
- Roaming Freedom: Traveling? Swap your SIM for a local one.
- On/Off Switch: When you sign up with a new network, they activate your SIM.
For a Fully detailed understanding of How SIM Card Works, You Can Check Our Detailed Article: How SIM Cards Work.
Indian citizens get a SIM card with a 10-digit unique code number assigned & assuming there are 1000 crore population & combinations assigned to each of them!
The first digits of your mobile number start with +91 (which is the country code of India) and are followed by digits like 6, 7, 8, or 9.
Why don’t numbers start with 0 And 1?:
0 is dedicated to STD numbers and telephone numbers starting with 1 are usually associated with helpline services that include police, fire services, ambulance, etc. For this reason, personal numbers in India cannot start with 1
Why don’t numbers start from 2,3,4,5?:
Since numbers starting 2, 3, 4, and 5 are noteworthy, they are used by landline phones. This is the reason why mobile numbers with these digits cannot be used as initial digits of mobile numbers
Why is India’s country code +91 internationally?:
International Telecommunication Union (ITU) recommendation defines the given country codes with the numbering plan used in the PSTN.
CCITT, the predecessor of the ITU Telecommunication Standardization Sector, developed the first formal list of telephone country codes. It was included in the 1964 CCITT Blue Book.
The list was organized by creating nine zones –
- Zone 1 – US, Canada, Bermuda, and other Caribbean islands
- Zone 2 – Africa & other Atlantic islands
- Zone 3 & 4 – Europe
- Zone 5 – Mexico, South America, Central America
- Zone 6 – Oceania and South-East Asia
- Zone 7 – Russia, former Soviet Union
- Zone 8 – East Asia and other special services
- Zone 9 – South, Central, West Asia and Middle East
India lies in Zone 9 which resembles the initial digit of 9 & it was the first country in the list to take a straw resembling the zone identity which added the 1 & gave the country code +91 internationally!
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