I've noticed the voice quality isn't the greatest.
I'm coming off an iphone though, and it had excellent quality.
To be honest, I hardly ever talk on my phone so it's not a deal breaker for me.
Don't get me wrong though, the quality is good. It's just not as crisp as my iphone. In my opinion, the l920 overall is leaps and bounds better than my iPhone so I'm willing to make that small sacrifice.
Can't believe I've spent the last 6 years of my life using an iPhone after only spending a day with this phone.