Do I need a new SIM to get 5G AT&T?

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You need to subscribe to one of the new unlimited plans that offer 5G . I have an iPhone 12 with a new SIM card installed by AT&T but I do not have one of the qualifying unlimited plans so my phone displays only 4G and LTE.

No, there is no 5G SIM card . Yes, you do have to have a 5G plan. It’s not something you can add, you either have a plan that supports 5G or you don’t. If you do have a 5G plan, the issue may be ATT does not recognize your device as a 5G phone.

At T-Mobile, there is no extra cost for Standalone 5G . Here’s all you need to get it (see FAQs for more details): A T-Mobile 5G compatible device that has received a software update to be compatible with Standalone 5G. A T-Mobile Standalone 5G compatible SIM card.