HTC

5.5 inch display
Android 6.0 Marshmallow Operating System
Quad-core 1.6 GHz Processor
up to 256 GB Memory Card Slot
16 GB Internal Memory
2 GB RAM
13 MP Rear Camera
5 MP Front Camera
Non-removable Li-Ion 2700 mAh battery

5.2 inch display
Android 6.0 Marshmallow Operating System
Octa-core  Operating System
up to 256 GB Memory Card Slot
64 GB Internal Memory
4 GB RAM
16 MP Rear Camera
16 MP Front Camera
Non-removable Li-Ion 2500 mAh battery

6.0 inch Display
Android 8.0 Oreo Operating System
Octa-core Qualcomm Processor
Up to 256 GB Memory Card Slot
128 GB Internal Memory
6 GB RAM
12 MP Rear Camera
8 MP Front Camera
Non-removable Li-Ion 3930 mAh battery