There's so much brilliance that goes into technology innovation. And yet, somehow this hasn't applied to the evolution of cordless phones.

The best cordless phones ever made were digital 900Mhz phones. The sound and range were great, and the digital technology prevented eavesdropping.

Then came 2.4Ghz cordless phones. This was perceived as an improvement, until everyone realized that 2.4Ghz phones interfere with many wi-fi networks. So now we have 5.8Ghz phones.

The perception seems to be that a higher frequency is better. 5.8 is more than 2.4, so it must be cooler. But this is patently wrong. Lower frequency waves penetrate walls better and travel further. A digital 900Mhz phone will prove much more useful than a 5.8Ghz phone.

Why has nobody re-introduced digital 900Mhz phones? I think it's because people assume 5.8Ghz is better. You would have to engage the public in a physics lesson.

Why not bring it back but name it something else? Or put 900Mhz in small print. Or just say it's better. This is a market failure that really needs to be corrected.