参考答案及解析：
1. 苹果手机的通话质量不稳定，且不支持立体声蓝牙耳机，3G的兼容性也不好。
2. No standard answer.
3. Lack of a physical keyboard.
4. The flaws list as follows:
A slow data network, and call quality that doesn‘t always deliver
The iPhone‘s lack of GPS, strangely omitted MMS ability, and the obligatory removable battery.
Also, it isn‘t supported by 64-bit Windows XP or Vista and doesn‘t work with most third-party headphones.
It also has variable call quality and lacks stereo Bluetooth support and 3G compatibility. It also has "stingy" integrated memory for an iPod.
The small screen makes it hard to read Web pages.
Call quality is average and they use an ancient EDGE network to connect to Web — and missing features like a memory-card slot, chat program and voice dialing. You also can‘t install new programs from anyone but Apple and the browser doesn‘t support Java or Flash.
The major drawback is the cellphone network — it isn‘t able to use AT&T‘s fastest cellular data network to sign online. Instead, it uses a "pokey network" called EDGE, which is "far slower than the fastest networks from Verizon or Sprint that power many other smart phones."
