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AT&T in US, Rogers and Fido in Canada, and Many Other Carriers Rolling Out eSIM Support on Latest iPhones
According to Apple's website, the latest carriers supporting the eSIM feature include AT&T in the United States; Rogers and Fido in Canada; 3 in Denmark and Sweden; Orange in Poland and Spain; Telia in Estonia and Finland; Telenor in Norway; Swisscom and Sunrise in Switzerland; Vodafone in Qatar; and select others.
In Asia, the eSIM feature can now be used with 1010, CSL, China Mobile, and SmarTone in Hong Kong; M1 in Singapore; APT in Taiwan; Airtel and Reliance Jio in India; and AIS, dtac, and True Move in Thailand.
AT&T's website confirms that it supports eSIM on the latest iPhones as of iOS 12.1.1, while Apple's website continues to state that Verizon and T-Mobile will offer eSIM service "later this year." We've heard from a few people that Verizon may enable support on Friday, but this is strictly word of mouth.
It seems that the rollout of eSIM functionality on iPhones is hit or miss at this point, as a MacRumors tipster claims to have set up eSIM with T-Mobile on the new 12.9-inch iPad Pro, while others have had no luck. The ball is definitely rolling, though, so hopefully eSIM support is more widespread by year's end.
The eSIM, or digital SIM, is a non-physical SIM card slot that pairs with the physical SIM card in the iPhone XS, iPhone XS Max, or iPhone XR to enable dual-SIM dual-standby, a feature that lets iPhone users have two phone numbers available at once — useful for travel or both personal and work lines on a single iPhone.