How to Add a Second Phone Number to an iPhone

To add a second carrier phone number, obtain a new voice-and-text plan from your carrier, then activate its SIM or open Settings > Cellular > Add eSIM on a compatible iPhone. Keep the existing line enabled, label both lines, and choose which handles calls and data. An app-based number is a separate alternative that works inside the provider’s app.

A second number on an iPhone can mean two different things. A second carrier line uses a supported SIM or eSIM and appears in iPhone Cellular settings, Phone, and Messages. An app-based number works through its provider’s app and internet connection; it does not become an iPhone cellular line. Choose based on whether you need ordinary carrier calls and SMS or an app-managed business or privacy number.

These steps use Apple’s current iPhone guidance, including iOS 27. Cellular may be called Mobile Data in some regions. Check the exact model and carrier before buying service: eSIM is a digital SIM, and neither physical SIM slots nor eSIM support are universal.

Choose the right kind of number

• New carrier number: ask a carrier for a second voice-and-text line, then activate its SIM/eSIM. A travel data-only eSIM does not itself supply a second voice/SMS number; a voice/text plan may not include data.
• App number: check the provider’s calling, messaging, verification-code, number-retention, porting, coverage, cost, and privacy terms. Calls and messages stay in that app.
• Transfer an existing number: use carrier-supported eSIM transfer. This moves the same number from another SIM or phone; it does not create a new one.

Add a second carrier line

1. Check model and carrier support. Apple supports a physical SIM plus eSIM on eligible models beginning with iPhone XR/XS and SE (2nd generation). Two active eSIMs require eligible newer models, including iPhone 13 or SE (3rd generation). Confirm your exact region’s arrangement with the carrier; some models have no SIM tray.
2. Check the carrier lock before choosing a different carrier. Open Settings > General > About and check Carrier Lock for No SIM restrictions. Apple’s unlocking guidance says only the current carrier can unlock a locked iPhone. A company-managed plan may also require administrator approval.
3. Request a new second number. Ask for the voice, SMS and data features you need, activation method, fees and ongoing cost. Porting or transferring an existing number moves that number; it does not create a second one. Keep your existing service until you have confirmed what the new activation will do.
4. Activate the new plan using the carrier’s instructions. For eSIM, connect to an available network, open Settings > Cellular > Add eSIM (or Set Up Cellular), and use the method supplied by the carrier. A QR-code method uses Use QR Code, sometimes under Other Options; scan the carrier’s code and enter its confirmation code if requested. Carrier Activation may instead show a Finish Setting Up Cellular notification, and some carriers use their app or an in-store check. Apple’s cellular setup guide explains these options.
5. Confirm both lines and set their roles. In Settings > Cellular, open each line and enable Turn On this Line. Use Cellular Plan Label for names such as Personal and Work. Return to Cellular and choose Default Voice Line for calls and Cellular Data for internet access. Test outgoing and incoming calls and texts with someone who agrees to help, confirming which number appears.

Apple’s Dual SIM guide says the iPhone uses one cellular-data network at a time. If your new plan is voice/text-only, keep a data-capable line selected for data. Review roaming charges before enabling Allow Cellular Data Switching, especially while traveling.

Use a physical SIM only if the model has a compatible tray. Obtain the carrier’s card and follow Apple’s tray instructions linked above. Do not guess a SIM PIN: an incorrect guess can lock the SIM. Converting your existing SIM to eSIM, or using Quick Transfer from another phone, transfers the existing line; the old SIM or phone can stop serving that number.

Choose which number to use

For a keypad call in Phone, enter the destination, tap the line shown near the top, and choose the number you want before calling. In Messages, start a new conversation, enter the contact, tap the current number, and choose the sending line. Apple’s Dual SIM support article shows these controls. Choose the line before the first message: Apple’s User Guide still warns about switching an existing SMS/MMS conversation, while its support article describes a line switch within conversations. If your thread does not offer that control, do not delete its history simply to try to reveal it; check the options for your iOS version and carrier.

If the new line appears but cannot call or text, confirm activation and plan features with the carrier before resetting network settings or deleting an eSIM. Deleting a working eSIM can interrupt service and require reactivation.

Use an app-based number instead

If you do not need a carrier line, select a number app based on its current terms. The app’s number will not appear as another SIM under Settings > Cellular, and its service depends on the provider and an internet connection.

• Check whether services you rely on accept its verification texts; some reject virtual or VoIP numbers.
• For a shared business number, require explicit team or shared-inbox features.
• Check number reclaim rules, porting out, recurring fees, supported countries, and what happens if you cancel.
• Review privacy terms and how calls or messages behave when the app or internet is unavailable.

Common questions

Can both carrier numbers receive calls? With properly activated Dual SIM, both lines can be used, but receiving a call on one while the other is in use depends on Wi-Fi Calling, data settings, and carrier support. Apple warns that without Wi-Fi Calling, the other line’s calls may go to voicemail without a missed-call notification.

Does converting my existing SIM to eSIM create another number? No. It changes how the existing line is stored; the old physical SIM usually stops working after conversion.

Can a travel eSIM give me another number? Only if that plan includes voice and text service. Many travel eSIMs offer data only.

Apple sources

Use Dual SIM on iPhone; Set up cellular service; and Using Dual SIM with an eSIM. Check carrier terms before buying or moving a line.

If the Second Line Will Not Activate

Apple’s eSIM troubleshooting guide recommends an internet connection, supported carrier and eligible iPhone. Update iOS, check for a carrier-settings update in Settings > General > About, then try turning Airplane Mode on and off or restarting the phone. If the new line appears, turn that line off and back on in Cellular settings. Do not delete the existing working eSIM as a routine troubleshooting step.

If activation still fails, contact the carrier with the error, phone number and account details through its official support channel. Ask it to confirm the plan was provisioned correctly. Once the new line works, our iPhone 5G settings guide explains how to check Voice & Data for the selected line. Keep the data-capable plan selected if your second line is voice-and-text only.