According to technical reasons we are not clever enough to be able to argue with, the version of the HTC One sold in the US lacks an SD card slot due to internal space restrictions. Because of something to do with our mobile radio frequencies. That’s what HTC says and we're powerless to argue.
The explanation comes from HTC’s Jeff Gordon, the company’s Senior Global Online Communications Manager. Jeff told Techradar: “Because the Chinese version of the One is designed specifically for the smaller Chinese radio bands, we do have additional space inside the device we were able to use for the microSD slot. That space isn’t available to us in the global version.” They could, of course, just made it a bit bigger, though. So we’re not entirely sure we believe them. [Techradar]