Restarting, Resetting, and Repairing - Sony Xperia Z5 Premium
An advantage of the Sony Xperia Z5 Premium (Dual E6833) is the possibility of using two mobile carriers, a device with two SIM card slots.
Sony Xperia Z5 Premium review: Astonishing resolution results ...
With one SIM card slot, the Sony Xperia Z5 Premium (E6853) allows download up to 300 Mbps for internet browsing, but it also depends on the carrier.
Sony Xperia Z Series Parts | iFixit - Page 2
Sony Xperia Z2 D6503 - 16 GB - Black - Gsm Unlocked CPU: Snapdragon 801 | 3GB RAM Screen: 5.2" | 1080x1920 pixels Camera: 20MP | 2160p Battery: 3200mAh | Li-Ion Storage: 16GB storage, microSD card slot.