I have a T-Mobile Samsung S21 5G. Same problem. Normal drive back and forth to my property and even my calls drop whenever my band changes to 5G UC in two spots along the highway. UC stands for Ultra Capacity regardless of what customer service says. I can run a speed test when on 5G UC and download at 300Mbps. Upload at 10. But cannot use internet, cannot text, cannot make calls. Makes no sense. They want you to see how fast it is with a speedtest but then block you from using it for normal purposes.
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