The Samsung Galaxy A51 - 128GB - Prism Crush Black, model SM-A516U right out of the box just made my old Samsung S5 Cell look like it was running on very slow clock. This cell is phenomenal in speed and capability. I finally got the 5G status code to show in the top screen bar and my Ookla app speed was 48.2 Mbps down and 14.2 Mbps up for the cell radio (note the WiFi radios were turned off). The 5Ghz WIFI got an Ookla of 312 Mbps down an 310 Mbps up. I'm well satisficed with this phone as it was an upgrade and ATT's upgrade was irresistible. My only complaint was the User Manual has missing details that a newbie would like to see - such as the 5G mode staus on top line . It is not mentioned at all how to make sure the cell is properly set up.