Apple’s latest iPhone supports 5G networks, but not if you use the device in dual-SIM mode, according to Apple internal training document Detection of the issue that started circulating on Reddit over the weekend.

The dual SIM mode is a An introductory feature on the iPhone line with the iPhone XSIt is useful for those traveling or staying abroad (or people with business and personal lines on the same device) by allowing both the actual Nano SIM line and only data service from another carrier to use an eSIM simultaneously.

But this clearly conflicts with the iPhone 12’s ability to run on 5G networks, at least for now. Here’s the syntax from the Apple document:

“Does 5G work with my SIM cards?”

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 an eSIM and are subscribed to a 5G service and operator plan, they will have 5G access.

Apple is said to be planning an update to fix the problem later this year. to me Mac rumors, Which cites an internal Verizon chip detailing the company’s 5G support for the iPhone. Currently, you can access 5G networks on iPhone 12 with either a Nano SIM line or an eSIM, as long as you only use one line at a time, which means eSIM users will have to remove the physical card from their iPhone 12 to reach 5G speeds.

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Apple did not respond to a request for comment on its plans to fix 5G compatibility while using the iPhone 12 in Dual SIM mode.