How can I plug a regular phone into my cell phone?

I'm in love with the idea of those Hulger handsets--they look like cool retro phones and plug straight into your cell phone. I have a Blackberry Pearl and it has a mini-USB jack. Is there any sort of mini-USB to phone jack converter that I could use so I can use the phones I have in my house?

This would be so nice since it would be more comfortable and would reduce my exposure to cell phone radiation.

if there is such a device, daydeal.com will have it