Personal cellphone attached to the on-star microphone and speakers

I was wondering if it would be possible to attach my personal cellphone to the microphone and speakers that the on-star system uses. I am not using the on-star function now. Just wondering.

Have a 2004 Chevy Tahoe Z71

Thanks Matt

Yes this is possible depending on what cellphone you use. a company out of Arizona makes a kit that installs in line with the factory stereo and mutes the radio on incoming calls. The company's number 480-921-8655. Cellsite I believe is the name of the company. I have had their kit in my 2003 Tahoe Z71 for about 18 months and it works great.

Thanks for the info.

Matt