According to Apple sales FAQ, using iPhone 12 in Dual SIM mode cuts down the speed to 4G LTE from 5G.
The dual sim mode on iPhone refers to the ability to switch between a SIM card and an eSIM operating on different carriers. An image from Apple’s web resources called ‘What you need to know about 5G on iPhone’ suggests that the iPhone 12 will not support 5G when the Dual SIM mode is active.
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Here is what the FAQ mentioned:
“Does 5G work with Dual SIM?”
When using two lines in Dual SIM mode, 5G data isn’t supported on either line and will fall back to 4G LTE. If customers are using eSIM only and are on a 5G-supported carrier and service plan, they’ll have 5G access.
This could be a software issue and Apple could fix it in its upcoming update. While the user who posted the image claims that an update will enable 5G while using dual SIM mode coming later in 2020.
This information is revealed in Apple’s training documents, but the company does not mention 5G anywhere in its Dual SIM support page which was last updated on September 26.
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