With iPhone XS, XS Max, and XR,
you can add a second phone line
and use both numbers on a single iPhone.
This is handy if you need a separate business number,
or if you're traveling out of the country
and want to use a local plan while you're away.
Here's how it works.
To activate dual SIM, you have to buy a plan from a carrier
in the form an eSIM.
Setup may vary depending on your carrier.
Some may require you to download their app
to purchase and activate the plan,
while others will provide a QR code.
if you're adding an eSIM using a QR code,
then tap Add Cellular Plan.
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From here, use your iPhone camera to scan the QR code.
When your iPhone detects the QR code,
you'll see this screen appear.
Tap Add Cellular Plan,
and then label your phone numbers
so you know which is which.
Tap Primary to label your original phone number.
You can pick a suggested label
like Personal, Business, or Travel,
or create your own custom label.
We'll change this one to Personal.
Now tap Secondary to label the new number you just added.
We'll use this one for travel.
When you're done, tap Continue.
Next, select a default number.
This is the number you'll use for iMessage
and to call or send messages
to contacts that are not in your address book.
Your other number will still be available for calls and SMS.
Then tap Done.
On the Home screen, you'll see two cell signal bars
that pair with each of your numbers.
Swipe down from the top right to open Control Center,
where you can get a better look at the cell signal strength
for each number.
Need to make a phone call?
Open the Phone app as usual and select a contact.
If you haven't assigned a preferred number
to the person you're calling, you'll use the number
from your last communication with this person
to start new phone calls and messages.
To assign a preferred number,
tap Last Used under the contact's name,
then select a number to always use.
If you dial an unsaved number like a new pizza place,
your iPhone will select your default number for the call.
You can change the number you're using
by tapping this gray bar with your default number
right above the number pad
and then selecting the line you'd like to use.
When you receive a phone call,
you 'll see an icon under the contact's name or number
that tells you which number the call is for.
Looks like Uncle Dave is calling my personal number.
I'll call him back later.
Sorry, Uncle Dave.
Let's send him a follow-up message.
In Messages, your default number will be used automatically
when you start a new message.
To change this, tap the green or blue bar
with your default number
and select which number you'd like to use.
You can only change the number when starting a new message.
It can't be changed in an existing message.
Then type out your message
and tap Send.
You can tweak the settings for each number at any time.
Just open Settings and tap Cellular.
And that's how you use two phone numbers on just one iPhone.
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