How you can connect your mobile device to A 2.4GHz network As you might know, every android uses different Wi-Fi bands to connect, like some mobiles can not be connected to 5GHz networks.
Tap Settings > Wi-Fi, tap the three-dot overflow icon, then tap Advanced > Wi-Fi Frequency Band. This will show you how crowded 2.4GHz and 5GHz are. Wi-Fi equipment in the U.S. often ships with its default Wi-Fi channel set to 6. In order to decide which connection to choose, you can scan the location for WiFi interferences.

For this, you can use an App called “WiFi Analyzer”. With Microsoft's recent firmware update for the Surface Pro 3, among the new bits and pieces was a new Marvell Wifi driver that lets you switch between 2.4GHz and 5GHz bands on the fly. However, all Wi-Fi devices on a network must use the same channel. How do I change my Android phone to 5ghz WiFi? How to change your router channel for the best Wi-Fi If you find your Wi-Fi connection is slow or drops out you can change which channel your router uses.

Now tap on Wi-Fi Frequency Band and pick the band from 2.4GHz and 5GHz. If you encounter interference from other devices in your home, change the channel up or down to avoid it. If you wish, you can force your Android device to connect to Wi-Fi hotspots using the speedier 5 GHz frequency band. To change the connection type (band) to 5GHz we need to access the router settings.