Originally Posted by murso74
My phone works on 5, but only if I force it. Otherwise it chooses 2.4. 10 feet from the router
Sent from my XT1058 using Tapatalk
There is a reason for that.
When your phone scans for a WiFi network, it scans through 11 wireless channels on 2.4Ghz (in the US). When your phone scans for 5Ghz it has more channels to scan through, 13-15 depending on your router.
That combined with already mentioned reasons such as better 2.4Ghz propagation in homes/offices makes it easier for the phone to connect. Whether 2.4Ghz or 5.8Ghz, every gain increase of 3dBm doubles transmit power. In one given spot with your router in another room, your 2.4Ghz signal is typically going to be stronger. It is going to choose the 2.4Ghz because the phone scanned and saw it, and the signal was strong.