Will cordless phones interfere with wireless internet?

Q: Will cordless phones interfere with wireless internet?
A: The answer is YES. You might face a problem if you are using a 2.4 GHz phone. This is the same frequency as your wireless router. It probably will not be noticed unless you have a lot of other things interfering such as satellite dishes and some remote controls also. Plus if you have a lot of other wireless networks in the area. It can cause problems as well.
More and more households and businesses today make use of cordless phones, which are made by various companies. Cordless phones operate on 3 different frequencies, 900MHz, 2.4GHz, and 5.8 GHz. Do those last two frequencies sound familiar? Yes, at least the 2.4GHz and 5.8 GHz frequencies fall in the same frequency bands as 802.11b and 802.11a wireless LANs, respectively -- and the use of the phones can cause significant interference to your WLAN.
Potential 802.11b Interference
Majority of cordless phones used today are of 2.4GHz models. These phones, innocent as they may seem, reap devastating effects on 802.11b WLANs. There are cases where 2.4GHz phones severely interfere with 802.11b. Some 802.11b WLANs have even been totally shut down by somebody simply answering a 2.4GHz cordless phone.
Resolutions to Consider
What can you do to eliminate the effects a cordless phone has on your WLAN? There are number of solutions, some of which are guaranteed to work and others that might significantly lower the interference level. The fail-safe solutions all consist of replacing equipment.
If your interference is coming from a 2.4GHz phone, the sure fire solution is to change to a 900MHz or 5.8 GHz phone or switch the WLAN to 802.11a. Both methods will eliminate the interference. These solutions are the most effective, but also the most expensive.
Before spending lot of money on new hardware, consider the following less expensive (but possibly less effective) approaches:
• With 802.11b systems, try changing the channel on the access point (at least try 1, 6, and 11). Anecdotally, people have found that they have the least interference on channel 11.
• With 802.11a systems, change to any one of the channels that are not in use by the cordless phone.
• Change the location of the access point or the cordless phone base. Maximize the distance between the cordless phones and WLAN devices, especially WLAN users operating on the fringes of the access point range.
• If you have the option, use an external, remote antenna on your computer. This will let you place the antenna as far away as possible from a cordless phone.
There are no guarantees that these actions will work, but they may cut the interference enough to allow acceptable performance. Most attractive aspects of these solutions, however, is the fact that they are free.

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