What is the general procedure to access the content on a mobile phone sim card?

Use this checklist to set up your new Android phone.

Inhaltsverzeichnis Show

Insert your SIM card
How to insert your SIM card
Connect to Wi-Fi
How to turn on and connect to Wi-Fi
Copy apps and data
Add your Google Account
Create a screen lock
Add your phone manufacturer or operator account
Related resources
What are the four categories of information that can be retrieved from a SIM card?
What structure is used for the file system for a SIM card?
What technique in which multiple phones take turns sharing a channel does the global system for mobile communications GSM use?
Which enables service providers to reprogram phones without having to physically access memory chips?

Insert your SIM card

Your SIM card is a removable chip that stores important info about your phone. Typically, you receive your SIM card from your mobile operator.

For most Android users, a SIM card lets your phone:

Have Internet services and other functions that rely on an Internet connection, like features for specific apps and services
Receive Android OS updates when you're not connected to Wi-Fi or a tethered device
Make or receive calls
Send or receive text messages

How to insert your SIM card

Important: Many devices will automatically approve your operator services after you insert your SIM card. If your device shows an error message or if you have any issues with your SIM card or operator services, get help from your mobile operator.

Find your SIM card.
Open the SIM tray on your device.
- The location of your SIM tray may differ from device to device. For specific questions about how to locate and open your SIM tray, get help from your device manufacturer.
Place your SIM card into the SIM tray.
Put the SIM tray back into your device.

Connect to Wi-Fi

You can set your phone to automatically turn on Wi-Fi and connect to a trusted network. When you have Wi-Fi turned on, your phone connects to nearby networks that you've connected to before. If you don’t turn on Wi-Fi, your device can only connect to the Internet through your mobile operator. Learn more about Wi-Fi networks on your Android device.

Tip: Connect to the Internet to get Internet services and other functions like:

Android OS updates, when you're not connected to your mobile operator’s Internet service or a tethered device
Features for specific apps and services that rely on an Internet connection

How to turn on and connect to Wi-Fi

Important:

Some of these steps work only on Android 10 and up. Learn how to check your Android version.
Some of these steps require you to tap the screen.
Call captioning only works on Pixel phones.

Tip: After you connect, the network is 'Saved'. When your phone is near and Wi-Fi is on, your phone automatically connects to this network.

Copy apps and data

To personalise your new device, you can copy apps, text messages, contacts, photos and other info from your old device. You may have to verify your Google Account during this process.

To copy apps and data, backup and restore data on your old device first.

Tips:

When you copy apps and data, it may take several hours. Apps and data aren’t removed from your old device.
Apps that are only available on iOS aren’t copied to your Android.
If you transfer apps and data:
- Wirelessly: You must be connected to the Internet the entire time.
- With a cord: You must be connected to your old device for the entire transfer process.
If you don’t copy your apps and data:
- You must manually download and install apps that you’ve installed on your old phone from the Play Store.
- Text messages sent and received on your old device aren’t saved.
- You must manually add your saved contacts.
- Your photos aren’t transferred.

Add your Google Account

Your Google Account lets you automatically sync photos, messages, email and data with other devices that you sign in to with your Google Account.

Download apps, books, movies and shows via Google Play
Set up backup and restore
Set up other Google apps and services like Gmail and Google Pay

Tip: You can add multiple Google Accounts to your device.

Create a screen lock

You can set up a screen lock to help secure your Android phone. Learn how to create a screen lock.

Tip: Some devices have a biometric screen lock option. Check with your phone manufacturer for more info.

Add your phone manufacturer or operator account

Some phone manufacturers and operators offer specific apps and services to users who are signed in to their operator account. For more info, get help from your mobile operator.

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SIM User Guideline

Android
iOS

If not displayed as a service area	Please restart the phone until you see signal bars. (If you still have no service after turning on and off over three times, the phone is likely locked)
If it says "No SIM Card" near the signal bars	Please check whether the SIM card is placed correctly. If it still fails to recognize the card, it is highly likely that the device is incompatible.

If your mobile carrier shows up as "KT" but cannot connect to our data service, please check the APN setting.

① Set up ② See more networks ③ Mobile network ④ Access point name

How to Set Up APN

If recognized automatically	Select the APN. APN(LTE)lte.ktfwing.com
If not recognized automatically	Under APN, click the menu button, add a new APN, and enter the following. APN(LTE)lte.ktfwing.com MCC450 MMSChttp://mmsc.ktfwing.com:9082 MNC08

If not displayed as a service area	Please restart the phone until you see signal bars. (iPhone 4S or earlier models may take over 15 minutes for the signal bars to appear)
If it says "No SIM Card" near the signal bars	Please check whether the SIM card is placed correctly. If it still fails to recognize the card, it is highly likely that the device is incompatible.

If your mobile carrier shows up as "KT" but cannot connect to our data service, please delete the profile and restart the device.

① Set up ② General ③ Delete Profile ④ Restart device

※ Please be cautious because once you delete the profile, it cannot be restored.

Cautions

KT SIM does not support the personal authentication.
Requirements: ID card(passport or certificate of alien registration), credit card
- A credit card in your name is definitely needed to pay a deposit (the expiration date of the credit card shall be more than 3 months away.)
- debit card is not permitted in paying a deposit.
If you fail to receive the terminal at the booked application date, then the booking will be automatically cancelled the next day.
Calls will be restricted when used for illegal spam calls.
The amount spend on voice top-up and extension of the expiration date is non-refundable.
To use this service, the country lock on your device must be turned off.
- Please contact your current telecommunications company to make sure that the country lock is off.
This service may not be able to be used with all device models and frequency bands.
After installing the SIM, the device may need to be turned on/off up to 5 times to recognize the SIM, depending on the device model.
Video calls may be unusable according to your mobile phone model.
For a lease of more than 50, please use "Multiple Leases Inquiry" menu.
For rental inquiries, contact KT Roaming Customer Center.
- +82-2-2190-0901(free everywhere at KT mobile phone, press 7 for foreign customer)
- for foreign customer : Mon~Fri, 9AM~6PM local time (Except on holidays)

Identity
Authentication
Service

What are the four categories of information that can be retrieved from a SIM card?

Information that can be retrieved falls into four categories:.

Service-related data, such as identifiers for the SIM card and the subscriber..

Call data, such as numbers dialed..

Message information..

Location information..

What structure is used for the file system for a SIM card?

The SIM card file system is organized in a hierarchal tree structure and resides in the EEPROM for storing data such as names and phone number entries, text messages, and network service settings.

GSM uses a version of time division multiple access (TDMA) to divide up frequencies in the electromagnetic spectrum for multiple users to access the mobile system [5]. In its implementation, CDMA utilizes a version of frequency division multiplexing.