What is eSIM? Where it is used? eSim

An eSIM is a technology built right into your phone. It's a small chip that's used to authenticate your identity with your carrier.

So no more physical SIM card required.

eSIM is a standardized SIM chip open to multiple mobile operators globally. It now allows consumers to store multiple operator profiles on a device simultaneously, and switch between them remotely, though only one can be used at a time.

eSIM will be available from many carriers. With iPhone XS and XS Max you'll either need to have a carrier's app or a QR Code you can scan. Again, the carrier will need to support eSIM.

eSIM is great for regular travellers

Theoretically, eSIM should mean that you could go to another country and simply add a roaming eSIM to your handset while retaining access to your main "home" number. That's one of the disadvantages currently because, if you change SIMs abroad, for example, you can't access your own number.
“eSIMs have the potential to eliminate roaming charges abroad", says Truphone's Steve Alder. "It also enables people to switch operators quickly to get connected if they’re in an area with no signal, frees up space for new features or additional battery life and could lower the risk of device theft.
"As consumers and operators begin to see the benefits, mass adoption of eSIMs will be inevitable.”

What does eSIM mean for devices?
One of the advantages it offers from a design point of view is that you make a smaller device because there's no need to accommodate a SIM card or the tray that holds it. There's also no need for networks to manufacturer or distribute lots of SIM cards.
eSIMs will also be great for other devices like laptops and tablets, where seamless connectivity will become the norm.
Vodafone says that eSIMs will enable more connected devices simply because eSIMs don't require so much room inside a device, enabling fitness trackers or even glasses to have stand-alone 4G connectivity in a way they just weren't able to before.

How to use eSIM with iPhone XS and XS Max
If you have a QR code:

1. Go to Settings > Cellular.
2. Tap Add Cellular Plan.
3. Use your iPhone to scan the QR code that your carrier provided - you may be asked to enter an activation code.

Or to activate with a carrier app:

1. Go to the App Store and download your carrier's app.
2. Use the app to purchase a cellular plan.

You should also label your plans in Settings > Cellular. Tap the number whose label you want to change. Then tap Cellular Plan Label and select a new label or enter a custom label.

Find wireless carriers that support eSIM till date 17Sept'18

Your iPhone Xs or iPhone Xs Max can have two cellular plans, one on a nano-SIM card and the other on an eSIM. Find out which wireless carriers in your country or region support eSIM.

Wireless carriers