Those are illegal.
USA: Illegal to operate, manufacture, import, offer for sale, including advertising (Communications Act of 1934, http://en.wikipedia.org/wiki/Communications_Act_of_1934 ) with fines of up to $11,000 and imprisonment of up to a year. (http://wireless.fcc.gov/services/index.htm?job=operations_2&id=cellular )
best buy or radio shack
You probably can’t buy one for Digital phones because the technology is entirely different that for analog phones.
They are illegal, regardless… so it’s a moot question.
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