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One of the biggest updates introduced by the iPhone 12 series is support for 5G, with all four models supporting mmWave and sub-6GHz bands. However, it seems that people who buy the iPhone 12, iPhone 12 Mini, or the iPhone 12 Pro duo you will not be able to enjoy blazing fast 5G speeds when dual SIM functionality is enabled. At least not initially.
According to an image from a retailer and carrier training manual that appeared on Reddit, none of the iPhone 12 models will support 5G when dual-SIM mode is activated. In response to a FAQ asking if 5G works with dual SIM, the training material says: “When using two lines in Dual SIM mode, 5G data is not supported on either line and will revert to 4G LTE. If customers only use eSIM and have a 5G-capable carrier and service plan, they will have access to 5G. “
What this means is that you have to remove the physical nano-SIM or disable the second line provided by the eSIM system to use 5G on the iPhone 12. Otherwise, both lines will work only with the 4G LTE standard. This is a strange limitation and will definitely be a disappointment for users who rely on dual SIM to keep their personal and business numbers separate. However, it seems that the problem is temporary and will soon be fixed by a software update.
The Reddit user who originally shared the user manual screenshot mentioned that Apple will release an update later this year that will end the aforementioned limitation and allow users to enjoy 5G in dual-SIM mode. In particular, Apple’s own support page that talks about dual-SIM and eSIM functionality doesn’t mention this limitation at all. But then the aforementioned page also doesn’t mention the iPhone 12 series and it will probably be updated once the iPhone 12 starts shipping.
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