Using Dual SIM with two nano-SIM cards

In mainland China, Hong Kong, and Macau, iPhone XS Max features Dual SIM with two nano-SIM cards. This gives you two phone numbers to make and receive calls and text messages. 

If you aren't in mainland China, or if you're in Hong Kong or Macau and have an iPhone XS, learn how to use Dual SIM with an eSIM.

Here are a few of the many ways you can use Dual SIM:

  • Use one number for business and another number for personal calls.
  • Add a local data plan when you travel outside of the country or region.
  • Have separate voice and data plans.

Both of your phone numbers can make and receive voice calls and send and receive SMS and MMS.* Your iPhone can use one cellular data network at a time.

* This uses Dual SIM Dual Standby technology, which means that both SIMs can make and receive calls. If one number is on a call, incoming calls on the other number will go to voicemail.

What you need

To use Dual SIM, you need a iPhone XS Max and two nano-SIM cards.

 

Here's how to install the nano-SIM cards:

Insert a paper clip or SIM eject tool into the small hole of the SIM card tray, then push in toward iPhone to remove your SIM tray, notice the notch in one corner of the new SIM card. Place the new SIM card into the bottom of the tray—it will fit only one way, because of the notch. Then insert the other SIM card into the top tray.

With the two nano-SIM cards in place, insert the SIM tray back into the device completely and in the same orientation that you removed it. The tray fits only one way.

If your SIM cards are protected with a personal identification number (PIN), note the position—front or back—of each SIM card in the tray. If asked, carefully enter the PINs for the front SIM card and back SIM card.

Label your plans

After your second plan is activated, label your plans. For example, you can label one plan Business and the other plan Personal.

You'll use these labels when you choose which phone number to use for making or receiving calls and messages, to designate a number for cellular data, and to assign a number to your contacts so you know which number you will use.

If you change your mind later, you can change your labels by going to Settings > Cellular and tapping the number whose label you want to change. Then tap Cellular Plan Label and select a new label or enter a custom label.

Choose how your plans work together

Set your default number, which iMessage and FaceTime use and which you will use when you call or send a message to someone who isn't in your Contacts app.

On this screen, choose a number to be your default, or you can choose which number is to be used only for cellular data. Your other number will be your default.

Use Primary as your default line: If you select this option, Primary will be used by default for voice, SMS, Data, iMessage, and FaceTime. Secondary will be available just for voice and SMS.

Use Secondary as your default line: If you select this option, Secondary will be used for voice, SMS, Data, iMessage, and FaceTime. Primary will be available just for voice and SMS.

Use Secondary for cellular data only: You might want to select this option if you are you're traveling internationally and you want to keep Primary for voice, SMS, iMessage, and FaceTime. This will allow you to use Secondary for data.

Use two phone numbers for calls, messages, and data

Now that your iPhone is set up with two phone numbers, here's how to use them.

Let your iPhone remember which number to use

When you call one of your contacts, you don't need to choose which number to use every time. By default, your iPhone uses the same number that you used the last time you called that contact. If you haven't called that contact, your iPhone uses your default number. If you want to, you can specify which number to use for your calls with a contact. Follow these steps:

  1. Tap the contact.
  2. Tap Preferred Cellular Plan.
  3. Tap the number you want to use with that contact.

Make and receive calls

You can make and receive phone calls with either phone number.

When you're on a call, an incoming call on your other phone number will go to voicemail, if you have voicemail set up with your carrier. However, you won't get a missed-call notification from your secondary number. Call Waiting works for incoming calls on the same phone number. To avoid missing an important call, you can turn on call forwarding and forward all calls from one number to the other. Check with your carrier for availability and to find out if additional fees apply.

Switch phone numbers for a call

You can switch phone lines before you make a call. If you're calling someone in your Favorites list, follow these steps:

  1. Tap .
  2. Tap the current phone number. 
  3. Tap your other number. 

If you're using the keypad, follow these steps:

  1. Enter the phone number.
  2. Tap the phone number, near the top of the screen. 
  3. Tap the number you want to use.

Send messages with iMessage and SMS/MMS

You can send messages with iMessage and use FaceTime on one phone line. To change which line uses iMessage, follow these steps: 

  1. Go to Settings > Messages. 
  2. Tap iMessage & FaceTime Line.
  3. Select the phone number you want to use.

You can use SMS/MMS to send messages with either phone number.* You can switch phone numbers before you send an SMS/MMS message. Here's how:

  1. Open Messages.
  2. Tap the New button, in the upper right corner of the screen.
  3. Enter your contact's name.
  4. Tap the current phone number.
  5. Tap the number you want to use.

* Additional fees might apply. Check with your carrier.

Learn about Dual SIM status icons

The icons in the status bar at the top of the screen show the signal strength of your two carriers. Learn what the status icons mean.

You can see more status icons when you open Control Center.

Change your cellular data number

One number at a time can use cellular data. If you want to change which number uses cellular data, follow these steps:

  1. Go to Settings > Cellular and tap Cellular Data. 
  2. Tap the number you want to use cellular data. 

If you are active on a voice number that isn't your designated data number, data will not work while you are on the call.

Manage cellular settings

To change your cellular settings for each of your plans, follow these steps:

  1. Go to Settings > Cellular.
  2. Tap the phone line whose options you want to set.
  3. Tap each option and set it as you normally would.

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