It's been about 3 weeks since I got my T650.

And I just had a phone call from co-worker in India and the sound quality was amazingly clear. Not sure if it's from Sprint or T650, but it was much clearer than even my landline phone at work. (I dont have landline phone at home)

When I had T-Mobile here in San Francisco, the voice quality has been either medicore or horrible, especially when I had international/long distance calls (which constituted 75% of my minutes)

I am really pleased to switch to Spring/T650 now :-)

Now only if P1 can address the horrible memory issues and many palm developers can update their apps with 650 support!!

BTW, this is without the voice/rom patch.