A standardised embedded SIM card would allow devices to switch carrier plans on a whim, and do away with pesky card slots, which somewhat explains the phone makers' excitement - there will be more precious space saved inside their thin smartphones for other components. The carriers that are whispered to carry the e-SIM standard at launch are AT&T, Deutsche Telekom, Etisalat, Hutchison Whampoa, Orange, Telefónica and Vodafone.
it had an advanced partnership with Gemalto, the largest SIM security provider, for embedding a Subscriber Identity Module in the next iPhone, but European carriers threatened to cut their subsidy for Apple's phones, so the idea was put on ice as too ahead of its time.Apple already has an electronic SIM in its latest iPads, though only T-Mobile and AT&T, as well as EE in the UK support it. A few years back,
As for when will the e-SIM standard hit, the GSMA had the following to comment: “With the majority of operators on board, the plan is to finalise the technical architecture that will be used in the development of an end-to-end remote SIM solution for consumer devices, with delivery anticipated by 2016.”