I have Cingular and use a Razr phone.  In Sept and Oct I traveled from Fla to Minnesota.  I used my laptop with Ui-View blue toothed to the phone.  I was connected almost 8 hours a day.  It worked great.  I only lost connection a few times and not for very long at a time.  I could even receive voice calls while connected.  However, while on voice the data flow would stop but would start again as soon as I ended the voice connect. 
Roger



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