Are any of the current iPhones 5G compatible?
Since 5G is a new technology, not sure what you mean by "current". No iPhone is compatible, but the next generation might be.
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Answer: No.
The long answer is that there are likely to be a couple of 5G compatible varients of the iPhone 12. Of course everything including the roll out of 5G itself is likely to be delayed thanks to COVID-19.
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