I have a Nexus 5 and I was wondering what power strategies/algorithms are used in it to save power when the screen is locked and the display is off. I wanted to have a practical first hand experience of seeing this happening. So I pinged the phone from my computer while it was connected to my WiFi network. I did performed the process twice - once while the phone was active and I was switching between/using apps on it, and the second time when the screen was locked and the display was off. I sent out 100 ping packets and here are the results: Ping during locked screen with display off Ping when the phone was active Summary: When screen was locked and display was off Minimum = 8ms, Maximum = 866ms, Average = 295ms Sporadic replies to ping, although no no packet was lost. Maybe the WiFi receiver was always on but the transmitter was only turned on periodically. A very large variance in the round trip times. When the phone was active Minimum = 3ms, Maximum = 387...