I have to host a meeting in a location without wired phone service but wanted to use my cell as way to communicate with several people off site. The speakerphone in the cell phone is clearly not robust enough for them to hear and for us to hear them well. Has anybody had success using a stand alone external speakerphone which would plug into I guess the microphone jack in my curve? I am looking for an economical solution here, so if anybody has a model number that would be helpful...