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I've been a fan of Google Voice since I started using it in earnest back in March. I now give out my Google Voice number (get yours here, but be prepared to wait a bit before it arrives) more than my mobile phone or my desk phone, and even have it on my business cards now. The features are great, but what I really like is that the number is truly portable: I just point the service at whatever phone, or phones, I want to use that day and my calls arrive there.
With Google Voice apps for mobile phones, I can also make calls from cellular phones that show the Google Voice number in the Caller ID displays of the people I'm calling. That is the killer feature of this killer app. But the experience is not the same on all phones. I've tried Google Voice on four different platforms -- iPhone, Blackberry, Android phone, and PC -- and one clearly stands out above the rest.
Not surprisingly, it's Google's own mobile phone platform, Android. The iPhone has great potential, but until Apple pulls its head out of its Apps Store, it's denied to us as a Google Voice platform. You can still use Google Voice in the iPhone, sort of, via the Safari browser, as I'll explain below.
There is a Blackberry version of the Google Voice app, which is not as full-featured as the Android app, but that has certain important advantages for corporate phone users. Finally, there's the old full browser-based Web app, which is highly useful even when you've got a Google Voice-equipped mobile phone sitting on your desk.
Let's look at how the platforms stack up for Google Voice, in order from good to bad...