It’s fairly common knowledge that Wi-Fi networking uses two frequencies: 2.4 and 5 GHz. It also been established that the 2.4 GHz band, which has been around forever, suffers from heavy doses of interference: Bluetooth devices, microwaves, wireless mice, cordless phones, and a whole host of older wireless devices cause havoc with the 2.4 GHz bandwidth. Meanwhile, the 5 GHz band, which is no spring chicken, either, having been around since the turn of the century, is still known to be less crowded and less prone to interference.
That may be changing, however. In the never-ending search for faster wireless connections, cell carriers are planning to make use of the 5 GHz Unlicensed LTE band as a back-up frequency for downloads and other use cases. This has caused worry for some; for example, Google has filed a motion with the FCC, detailing its concern of the possible congestion in the 5 GHz band that will result from the mixing of licensed and unlicensed frequencies. It seems that it’s only a matter of time before the 5 GHz bandwidth will be dealing with interference issues of its own.