How to Set Up Cellular Service on iPhone 16

Key Takeaways

• Learn how to activate cellular service using either a physical SIM or eSIM.
• Follow simple steps to set up an eSIM via QR code, carrier app, or phone-to-phone transfer.
• Understand the requirements and limitations for U.S.-based iPhones and international models.

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Your iPhone 16 needs a SIM card—either physical or digital (eSIM)—to connect to a cellular network for calls, texts, and data. Whether you’re setting up a new line or transferring from an older device, it’s important to choose the right method for your model and carrier.

To set up an eSIM:

1. Make sure your iPhone is connected to Wi-Fi or a cellular network.
2. Open Settings > Cellular.
3. Tap Set Up Cellular or Add eSIM.
4. Choose one of the following methods:

a. eSIM Carrier Activation

• Contact your carrier to have a new eSIM assigned.
• When prompted with Finish Setting Up Cellular, tap the alert or go to Settings > Cellular > Set Up Cellular.

b. eSIM Quick Transfer (iOS 16 or later)

• Tap Transfer From Nearby iPhone or select your phone number.
• On your old iPhone, confirm the transfer when prompted.

After transfer, the phone number will no longer work on your previous iPhone.

c. Scan a QR Code from your carrier

• Tap Use QR Code, then scan the code provided by your carrier.
• If needed, enter a confirmation code manually.

d. Transfer from a different smartphone (not an iPhone)

• Contact your carrier directly to assist with the number transfer.

e. Activate through your carrier’s app

• Download the app from the App Store and follow the in-app steps to activate service.

After completing setup, confirm that the eSIM is activated by checking Settings > Cellular and making sure your new line is turned on.

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To install a physical SIM:

Physical SIMs are not supported on iPhone 14 and later U.S. models, including iPhone 16 purchased in the U.S.

1. Insert a paper clip or SIM eject tool into the small hole on the SIM tray (usually on the left side).
2. Gently push to eject the tray.
3. Place the SIM card in the tray with the angled corner aligned.
4. Reinsert the tray back into your iPhone.
5. If prompted, enter the SIM PIN carefully (if previously set).

Warning: Don’t guess your SIM PIN—incorrect attempts may permanently lock your SIM.

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To convert a physical SIM to an eSIM:

1. Open Settings > Cellular.
2. Tap Set Up Cellular or Add eSIM.
3. Select the phone number using a physical SIM.
4. Tap Convert to eSIM, then follow the instructions.

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Frequently Asked Questions