I want to adapt my cell phone to old style handset

I only use cell phones these days because the usage charges are far less for me than land lines. But I like the handsets for landlines. Does anyone know of any system where I can plug my cell phone into an old style earpiece and mouthpiece? And no, don’t send me to a crappy Bluetooth system, I want a real earpiece et al.

http://www.thinkgeek.com/gadgets/electronic/8928/

http://www.thinkgeek.com/gadgets/electronic/7830/

Something like that?

http://www.smarthome.com/9621/Universal-Desktop-Station/p.aspx

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