Use many Cell phones as trunk in Asterisk

At this time it is possible to use bluetooth to connect your Asterisk server to your cell phone. I am looking for a practical solution which will allow me to connect 200 cell phones to asterisk and use them at the same time without interfarence I must be able to do the following with Asterisk and the phone Use phone as Trunk / incoming and outgoing Send sms from email / IM Receive sms to email / IM check balance (eg, type code *100 , read balance from text and send to email) get sip error codes eg 503 , 486 etc I must be able to use virtually any number of cell phones ( will use about 200 to start) Preferred phone is Motorola Razor but I am willing to listen to suggestions (phone must be cheap as possible) Final product must have a easy to run script for future installation Initially I had posted a usb request but now it looks like that is not possible so i would like to go with bluetooth alone but interference must be eliminated when placing your bid please let me know what strategy you will use to eliminate interference