Wi‑Fi is a trademark of the Wi-Fi Alliance, which restricts the use of the term Wi-Fi Certified to products that successfully complete interoperability certification testing. Wi-Fi ( / ˈ w aɪ f aɪ/) is technology for radio wireless local area networking of devices based on the IEEE 802.11 standards. Personal computers, gaming consoles, televisions, printers, mobile phones This technology was designed to ward off eavesdroppers, but the phone will change channels at random, leaving no Wi-Fi channel safe from phone interference. The last will sometimes not be successful, as numerous cordless phones use a feature called Digital Spread Spectrum. Several different Wi-Fi channels are available and it is possible to avoid the phone channels.VoIP/Wi-Fi phones share the Wi-Fi base stations and participate in the Wi-Fi contention protocols.DECT 6.0 (1.9 GHz), 5.8 GHz or 900 MHz phones, commonly available today, do not use the 2.4 GHz band and thus do not interfere.Using cordless phones that do not use the 2.4 GHz band.Using wired phones, which do not transmit.There are several ways to avoid this however, some simple, and some more complicated. This can cause a significant decrease in speed, or sometimes the total blocking of the Wi-Fi signal when a conversation on the phone takes place. Many of the cordless telephones and baby monitors in the United States and Canada use the 2.4 GHz frequency, the same frequency at which Wi-Fi standards 802.11b, 802.11g, 802.11n and 802.11ax operate. Main articles: Cordless telephone and Baby monitor
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