What to do if you hear radio communications on your telephone

Interference occurs when your telephone instrument fails to "block out" a nearby radio communication. Potential interference problems begin when the telephone is built at the factory. All telephones contain electronic components that are sensitive to radio. If the manufacturer does not build in interference protection, these components may react to nearby radio communications. Telephones with more features contain more electronic components and need greater interference protection. If you own an unprotected telephone, as the radio environment around you changes, you may sometimes hear unwanted radio communications. Presently, only a few telephones sold in the UK have built-in interference protection. Thus, hearing radio through your telephone is a sign that your phone lacks adequate interference protection. This is a technical problem, not a law enforcement problem. It is not a sign that the radio communication is not authorized, or that the radio transmitter is illegal.

Because interference problems begin at the factory, you should send your complaint to the manufacturer who built your telephone. A sample complaint letter is provided here.

You can also stop interference by using a specially designed "radio-proof" telephone, available by mail order. A recent FCC study found that these telephones, which have built-in interference protection, are a very effective remedy. 

Interference problems in telephones can sometimes be stopped or greatly reduced with a radio filter. Install this filter at the back of the telephone, on the line cord, and/or at the telephone wall jack. Radio filters are available at local phone product stores and by mail order. (See attached list, Radio Interference Filters.) 

To get started, follow these steps: If you have several telephones, or accessories such as answering machines, un-plug all of them. Then plug each unit back in, one at a time, at one of your wall jacks. Listen for the radio communication. If you hear interference through only one telephone (or only when the answering machine is plugged in), then the problem is in that unit. Contact the manufacturer of that unit for help. Alternatively, simply stop using that unit, replace it with a radio-proof model, or install a radio filter. (NOTE: Only a very small percentage of interference problems occur in the outside telephone lines. Your local telephone company can check for this type of problem.)

Next, it's important to follow through and contact the manufacturer. Telephone manufacturers need to know if consumers are unhappy about a product's failure to block out radio communications. Also, the manufacturer knows the design of the telephone and may recommend remedies for that particular phone.

To file a complaint, write a letter to the manufacturer, using the sample_letter at the end of this document. To help the manufacturer select the right remedy, be sure to provide all the information in the sample, including the type of radio communication that the telephone equipment is receiving. You can identify the type of radio communication by listening to it. There are three common types:

(1) AM/FM broadcast radio stations - Music or continuous talk distinguishes this type of radio communication. The station identifies itself by its call letters at or near the top of each hour.

(2) Citizen's Band (CB) radio operators - These radio operators use nicknames or "handles" to identify themselves on the radio. Usually, the CB operator's voice is clearly heard. You may also hear sound effects or other noises.

(3) Amateur ("ham") radio operators - Amateur radio operators are licensed by the FCC. They use call letters to identify their communications. The amateur's voice can be heard but may be garbled or distorted.

Cordless telephones are low-power radio transmitters/receivers. They are highly sensitive to electrical noise, radio interference, and the communications of other nearby cordless phones. Contact the manufacturer for help in stopping interference to your cordless telephone.

Final note: Current FCC regulations do not address how well a telephone blocks out radio communications. At present, FCC service consists of the self-help information contained in this bulletin. A partial list of radio-proof telephones and radio filters is also attached.

The FCC strongly encourages manufacturers to include interference protection in their telephones as a benefit to consumers. The telephone manufacturing industry has begun to develop voluntary standards for interference protection. The FCC will continue regular meetings with manufacturers and will closely track the effectiveness of their voluntary efforts.


and address of
telephone manufacturer

Dear Manufacturer:

I am writing to register a complaint about telephone equipment I purchased
(manufactured by your company).  Unfortunately, your product is receiving
a nearby radio communication, making it difficult for me to complete
telephone calls.  Please contact me within 30 days to discuss what steps
your company will take to make my telephone work properly.

Thank you for your help.

I look forward to your prompt reply.

Name:___________________________   Telephone:_________________________



Type of telephone equipment:__________________________________________

Model Number:_________________________________________________________

Description of Interference (AM/FM, CB, Amateur, etc):

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