https://www.cnet.com/news/samsung-att-hint-that-a-5g-phones-and-service-will-cost-you/

But change isn't cheap. Carriers are spending billions of dollars to build out 5G networks while also making their existing 4G networks faster, and carriers and device makers will need to recoup costs when these 5G phones and service plans go on sale.

The shift to 5G also provides carriers and phonemakers an opportunity to charge a premium for these top speeds, especially when adding a 5G product or plan can make 4G phones seem cheaper by comparison.