What is an eSIM and how will it change connected devices for the better?

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Apple and Samsung have been in talks with major network providers to adopt electronic SIM cards for future smartphones. Samsung used the GSMA enabled eSIM on its Gear S2 Classic 3G, but now Apple has also turned to eSIM to add connectivity to the Apple Watch Series 3, announced on 12 September 2017.

 The use of eSIM brings a number of advantages to device manufacturers, but there's also some advantages for the user too.

 But what exactly is an eSIM? And what exactly will it offer if your next device supports it? Let us explain...

What is an eSIM?

The term "eSIM" relates to a new
                                                                           
standard being promoted by the GSMA - the association that represents network operators worldwide.
It will come in the form of an integrated SIM chip, one that cannot and  need not be removed from a device - something that consumer electronics manufacturers are also keen to adopt for connected items around the house as part of the Internet of Things, and something that's been used by some car manufacturers too.
The information on it will be compliant or
rewritable by all operators, meaning a user can decide to change operator with a simple phone call. A new SIM will not be required, nor should there be any time delay in switching the eSIM to its new purpose. There will also be no physical swapping over required by the user.
That was the original premise of the eSIM, but 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, hence the use in devices like the Apple Watch 3.

How does this relate to the Apple Watch 3?

With the announcement of the Apple Watch 3, Apple confirmed that the new connected version of the watch will be using an eSIM. It will be on the same number as your iPhone, so there will be a seamless experience across the two devices. For the Apple Watch 3, that means you can use messaging services, place calls, use mapping or stream music without your phone. 

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