Modern routers will typically offer both types to provide the most spectrum for congested Wi-Fi networks, and modern smartphones and laptops will likely support 5 GHz networks. Over shorter distances, the broader channels of 5 GHz can allow for faster data transfers, but not all devices support the frequency. The 5 GHz offering gives faster speeds, more channels, and more room for devices to transmit than 2.4 GHz, but it suffers from some limitations in range. That makes it challenging to pack too many devices on to the same network, primarily because most IoT Wi-Fi devices operate on 2.4 GHz only. As you can see in the picture above, devices on channels one and two would interfere with each other and share a lot of space on the radio spectrum.
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