How to use the Dual SIM iPhone XS/Max on Verizon, T-Mobile and AT&T

Perhaps the most overlooked new feature of the iPhone XS and XS Max is their Dual SIM Dual Standby abilities, after 10 years of deliberation. There have been millions of users, especially in Asia or Europe, carrying an iPhone plus another phone, just because Apple was saving this option for some future "S" year.

This time around, iPhones are probably going to explode in terms of market share in Asia and Europe, precisely on account of the Dual SIM feature, as it is a common practice there to use two numbers for various reasons, be they plan prices, or traveling abroad. 

That's not to say that XS and XS Max users in the US can't benefit from the Dual SIM options as well, so here is what it all means for the new era when you can use two carriers on one and the same iPhone.


What you need: unlocked iPhone XS or Max with iOS 12.1 AND a carrier-provided QR code or app for setting up the eSIM

What you can do: use one CDMA and one GSM, or two GSM carriers. Receive calls and send texts on both cards, but not at the same time. Use one card for calls/texts, and another for data. Store many eSIM plans, but use only one at a time. Set preferred line for individual contacts, or iMessage/FaceTime.

What you can't do: use two CDMA carrier plans on one iPhone. Receive a "call waiting" or "missed call/text" notification for one card when you are using the other during calls or texts. Use both cards for data.

What is an iPhone eSIM?

Back in 2010, European carriers got pretty stirred up by Apple's intent to get even more influential, solder a SIM card into the next iPhone, and allow people to flash it for use with any carrier they want via a simple app download. Well, that's what the eSIM is, a virtual subscriber identification module chip with no plastic carrier surrounding it. 

At the time, EU carriers threatened to cut subsidies they doled out to Apple for each iPhone, as well as taking the Apple promos off their home pages in a short-lived retaliation. Well, subsidies are now gone anyway, and honey badger doesn't care, Apple finally outed its first eSIM iPhones. Previously it had iPads and Apple Watch with the tech, but when the world's most popular consumer electronics product is involved, all carrier bets are off.

Dual Standby or Dual Active

Unfortunately, Apple's been snubbed by Qualcomm as intellectual property thief, and Intel is taking over only until Apple develops its own cellular modems. Thus, in this transitional year in terms of LTE connectivity, Apple didn't come up with a Dual SIM Dual Active solution on the new iPhones but rather supports the humble Dual Standby mode only.

Dual Standby still means that both SIM cards can listen to their own mobile networks at the same time. They can even be from one carrier and connected to the same mobile network independently as if you were carrying two different phones. So, what's the difference?

Well, there is only one set of hardware for both SIM cards, so they have to share it, guided by software algorithms. There is no difference with Dual Active phones when the handset is in standby mode, but if you get a call or are texting from one card on the 2G network, the other SIM card won't be active. Likewise, you won't even get a notification for the missed call while talking, but you can forward calls to your primary number. As for data, you can only use data on one card at a time, and can't browse on the other card at all while in a call.

Verizon, AT&T, T-Mobile, and Sprint Dual SIM iPhone matrix

Apple has the three largest US carriers listed as supporting the eSIM in the iPhone XS and XS Max, and Sprint confirmed it will, too. In practical terms, when it comes to using Verizon or Sprint which are CDMA carriers, you can only use them on one SIM, but can't use CDMA on the other. Here's what that means:

In addition, your iPhone has to be unlocked by your carrier or by Apple. Otherwise, you will only be able to use two services from one carrier, and that's with GSM ones like T-Mobile or AT&T only. 

Long story short, don't expect to have a cheap Sprint plan on one card, for unlimited everything in the cities, and cheap prepaid Verizon on the other for the extra coverage on the road or in the boondocks. Bummer.



1. underwood2012

Posts: 61; Member since: Sep 12, 2009

I’m pretty sure you’d actually be able to use Sprint & Verizon at the same time, but only if you are on the LTE-only option with Verizon. For example, using an unlocked AT&T iPhone & activating it on Verizon gives you access to the LTE network only. Wouldn’t the same be true with using an unlocked Sprint iPhone XS or XS Max on Verizon? Verizon has always been very strict with BYOD devices being used on their 3G network, but have been running a BYOD program with access to just LTE for years.

3. tuminatr

Posts: 1169; Member since: Feb 23, 2009

I have had several non Verizon devices and have never had any issues. The phones will use CDMA if the device is capable of supporting that network, CDMA settings are unlocked and is an approved device. I haven't seen my phone say 3g in the past few years so even if your device only picks up LTE this is a very minor issue.

5. monkeyb

Posts: 414; Member since: Jan 17, 2018

I was just about to type the exact same thing and I read your comment. Keep Verizon as the esim part for the best coverage and use Sprint SIM card just for unlimited LTE. Don't know why this option won't work, but hey I could be wrong.

9. tuminatr

Posts: 1169; Member since: Feb 23, 2009

its a maybe, try it and post your results

2. MarvzIsFallen

Posts: 646; Member since: Aug 11, 2017

And butthurt androids will be saying: We had this a very long time ago. Sucks again! Never I had an android phone.only apple products.

4. tuminatr

Posts: 1169; Member since: Feb 23, 2009

It will be interesting to see if Google unlocks this capability with the Pixel 2. If you didn't know the pixel 2 and pixel 2 xl both have a nano sim slot and e-sim

6. Tipus

Posts: 906; Member since: Sep 30, 2016

What? :)))

8. strategic_developer

Posts: 1627; Member since: Jul 17, 2018

Why do they need to say it. You just did. But with Android, you a tally insert your own SIM. Not this download an app and scan a code BS. Apple always wanna convolute stuff a d. Ake you hate using it. Also, just FYI because you have only used IPhones and are just behind on everything, there were flip phones with dual SIMs, even before smartphones. In the US, overall this is a useless feature. But if you travel it becomes useful even if for limited purposes.

10. yobolegend

Posts: 53; Member since: Sep 14, 2016

Good start for ios ecosystem but not new feature in android world.

11. rigorkrad

Posts: 11; Member since: Jun 08, 2014

sprint IS NOT supporting the ESIM , YET you will need nano sim for Sprint

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