It may be very convenient to be able to use the phone wherever you may be around the house or office, but the trouble with the cordless technology is that you might as well be transacting your business over Citizen’s Band Radio – anyone can listen in: now Cincinnati Microwave Inc says it has developed a cordless phone that uses an encryption system for complete security and, it claim, operates over a remarkable range of up to half a mile; the phones will be introduced in October, costing under $300.