A:
- The US GSM version is optimized for specific bands/carriers used only in the US, supports up to 3G, comes in both 8GB & 16 GB, and does *not* have an SD slot.
- The Global GSM version supports up to 3G, comes in both 8GB & 16 GB, and does *not* have an SD slot.
- The Universal 4G LTE version supports up to 4G, comes only in 8GB, and *does* have an SD slot.