The chips maybe, but the antennas still need to provide the right bands: https://www.apple.com/iphone/LTE/ https://www.apple.com/iphone/LTE/ There is some add

The chips maybe, but the antennas still need to provide the right bands: https://www.apple.com/iphone/LTE/ https://www.apple.com/iphone/LTE/ There is some additionally complexity in that many of these can speak GSM, so have some ability to work in degraded modes. And then another round of complexity in that the CDMA versions usually can be unlocked into GSM mode, losing the CDMA functionality but allowing for more general use (but not generally 4G).