How to Use Dual SIM on iPhone: A Comprehensive Guide (2023)

In this article, we will provide a comprehensive guide on how to use dual SIM on an iPhone. Dual SIM functionality allows you to use two different phone numbers on the same device, making it convenient for managing personal and work calls, using local data plans while traveling, or separating voice and data plans. We will cover the following topics:

1. Introduction to Dual SIM on iPhone
2. Requirements for Using Dual SIM
3. Setting Up Another Cellular Data Plan
4. Labeling Your Plans
5. Setting a Default Number
6. Using Two Phone Numbers for Calls, Messages, and Data
7. Changing the Number for Outgoing Calls
8. Sending Messages with Different Numbers
9. Understanding the Status Icons
10. Managing Cellular Data Settings
11. Additional Information and Considerations

1. Introduction to Dual SIM on iPhone

Dual SIM functionality on iPhone allows you to use two different phone numbers on the same device. This feature is particularly useful for individuals who want to separate personal and work calls, use local data plans while traveling, or have separate voice and data plans. With dual SIM, you can make and receive calls, send and receive messages, and use data with both numbers.

2. Requirements for Using Dual SIM

To use dual SIM on an iPhone, you will need the following:

• An iPhone XS, iPhone XS Max, iPhone XR, or a later model running iOS 12.1 or later.
• A cellular service provider that supports eSIM technology.
• If you want to use two different service providers, your iPhone must be unlocked. Otherwise, both plans must belong to the same provider.
• If your primary SIM card belongs to a CDMA carrier, the secondary SIM card will not be compatible with CDMA technology. Contact your carrier for more information.
• For enterprise or business cellular data service plans, check with your company or workplace administrator to see if this feature is supported.

3. Setting Up Another Cellular Data Plan

To set up another cellular data plan on your iPhone, follow these steps:

1. Go to "Settings" on your iPhone.
2. Tap on "Cellular" or "Mobile Data."
3. Tap on "Cellular Data."
4. Select the number you want to use for cellular data.
5. If you enable "Allow Cellular Data Switching," your iPhone will automatically switch to the number you are using for voice calls during a call. This allows you to use both voice and data services simultaneously.
6. If you disable "Allow Cellular Data Switching," data services will not work during a call with the number that is not designated for cellular data.

4. Labeling Your Plans

Once you have activated the second plan, you can label both plans to easily identify them. For example, you can label one plan as "Work" and the other as "Personal." To label your plans, follow these steps:

1. Go to "Settings" on your iPhone.
2. Tap on "Cellular" or "Mobile Data."
3. Tap on the number you want to label.
4. Tap on "Cellular Plan Label."
5. Choose a label from the list or create a custom label.

5. Setting a Default Number

You can choose a default number to use when calling or messaging someone who is not in your contacts. You can also select which cellular data plans to use for iMessage and FaceTime. To set a default number, follow these steps:

1. Go to "Settings" on your iPhone.
2. Tap on "Cellular" or "Mobile Data."
3. Tap on "Cellular Data."
4. Choose the number you want to set as the default.
5. If you want to use both cellular data plans depending on coverage and availability, enable "Allow Cellular Data Switching."

6. Using Two Phone Numbers for Calls, Messages, and Data

Once you have set up dual SIM on your iPhone, you can use both phone numbers for calls, messages, and data. Here's how:

• Making and Receiving Calls: You can make and receive phone calls using either of the two numbers. If your other number supports Wi-Fi calling, you can answer incoming calls with that number while on a call with the primary number.
• Sending and Receiving Messages: You can send and receive messages using either of the two numbers. When starting a new conversation, you can choose which number to use.
• Using Data: By default, cellular data can only be used with one number at a time. However, if you enable "Allow Cellular Data Switching," your iPhone will automatically switch to the number you are using for voice calls during a call, allowing you to use both voice and data services simultaneously.

7. Changing the Number for Outgoing Calls

If you want to change the number you are using for outgoing calls, follow these steps:

• When Calling from Favorites: Tap the information button next to the contact's name, tap the number you are currently using, and select the other number.
• Using the Keypad: Enter the number you want to call, tap the number you are currently using near the top of the screen, and select the other number.

8. Sending Messages with Different Numbers

You can choose which number to use when sending a message. Here's how:

• Before Sending a Message: Open the Messages app, tap the new message button, enter the contact's name, tap the number you are currently using, and select the other number.
• During a Conversation: Tap the number you are currently using near the top of the screen, and select the other number.

9. Understanding the Status Icons

The status icons displayed in the status bar at the top of the screen represent the signal strength of both operators. Here's what each icon means:

• When Operator 1 is in Use: The other line will show "No Service" status.
• When Operator 2 Uses Wi-Fi Calling: The status bar will show that the device is connected to Wi-Fi, and Operator 2 uses Wi-Fi calling.
• When "Allow Cellular Data Switching" is Enabled: The status bar will show that Operator 1 uses 5G, and Operator 2 uses cellular data from Operator 1 and has Wi-Fi calling enabled.

10. Managing Cellular Data Settings

To change the settings for each cellular data plan, follow these steps:

1. Go to "Settings" on your iPhone.
2. Tap on "Cellular" or "Mobile Data."
3. Tap on the number you want to edit.
4. Adjust each setting according to your preferences.

11. Additional Information and Considerations

• Dual SIM functionality is available on iPhone XS, iPhone XS Max, iPhone XR, and later models.
• The iPhone 13 and later models can support two active eSIMs.
• iPhones without a physical SIM tray can also support two active eSIMs.
• Dual SIM functionality may not be available in all regions or with all carriers.
• Some carriers may charge additional fees for using dual SIM or have specific requirements.
• Ensure that your iPhone is running the latest version of iOS to access all dual SIM features.

In conclusion, this comprehensive guide has provided detailed instructions on how to use dual SIM on an iPhone. By following these steps, you can easily manage multiple phone numbers, separate personal and work calls, and use local data plans while traveling. Dual SIM functionality on iPhone offers flexibility and convenience for users who require multiple phone numbers on a single device.