Call quality
When we reviewed the original iPhone, we withheld our Editors' Choice Award largely over middling call quality due to low volume and a slight background hum. The iPhone 3G corrects these problems--our tests revealed louder volume and clearer audio. We also noticed that we could hear better at a variety of angles, whereas the first iPhone had a sensitive sweet spot. Reception didn't vary between GSM and HSDPA calls.
iPhone 3G also improves speakerphone calls. The phone's external speaker creates louder output, and callers said they can hear us better. Voices don't sound quite as natural, but that's typical on a speakerphone. Automated calling systems could understand us via regular or speakerphone calls. The iPhone's signal remained strong during our initial testing period in our San Francisco office, but we'll test it in more environments over the coming days.
Apple rates the iPhone 3G's battery at 5 hours of talk time over 3G and 10 hours over AT&T's standard cellular network; 6 hours of Internet time on Wi-Fi, or 5 hours over 3G; 7 hours of video playback; 24 hours of music playback; and a standby time of 12.5 days. We'll conduct a full round of battery tests over the next few days, but for the moment the battery life does seem to drop faster than on the original iPhone, particularly while using the 3G network. That's to be expected, but we noticed that after a half-day's use, the battery life dropped by about 30 percent.
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