How Physical Cards Work

 

Have you ever wondered how that tiny physical phone card in your phone actually works? Let's break it down in simple terms !

 

SIM cards are like your ID for the mobile network. When you power on your phone with a SIM card, it sends a code (IMSI) to the cell tower. The tower checks this code with the carrier's database. If it matches, your phone can connect to the network, allowing you to call, text, and surf the web.

Phone cards use encryption to keep your calls and texts safe. They turn your messages and calls into a secret code. Without the right "key," no one can read or hear them.

 

For calls

the card works with your phone's chip. It encrypts your voice, which is turned into digital signals, and sends them to the other phone via the cell tower. It also manages call setup and ending.

 

When texting

 the card encrypts your message and sends it to the carrier's message center. The center sends it to the correct phone. When you receive a text, the card decrypts it for you to read.

 

For internet use

the card helps your phone connect to the network, gets important details like an IP address, and keeps your data secure.

Other phone cards like CDMA and GSM work similarly, but with different technologies. Still, they all identify you, protect your info, and enable phone features.

 

Next time you use your phone, remember that tiny card does a lot!