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正翻译步骤 3

步骤 3
The SIM slot is gone. According to Apple, the SIM card and SIM tray were the only user-serviceable parts in the AT&T iPhone 4. Apple now says "iPhone does not contain any user-serviceable parts." We believe you have the right to repair your own hardware, and we'll have a repair guide available right away.
  • The SIM slot is gone. According to Apple, the SIM card and SIM tray were the only user-serviceable parts in the AT&T iPhone 4. Apple now says "iPhone does not contain any user-serviceable parts." We believe you have the right to repair your own hardware, and we'll have a repair guide available right away.

  • We believe the additional break in the antenna enclosure on the right side of the phone is a result of the switch from GSM to CDMA. An antenna's operating frequency is directly dependent on its size and geometry, so the change-up required an antenna overhaul.

  • The AT&T GSM iPhone has three differently shaped antennas, which enable the phone to communicate on UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz) and GSM/EDGE (850, 900, 1800, 1900 MHz).

  • The CDMA iPhone, which has four antenna segments (two "U" shaped pieces at the top and bottom, and two straight bars along the edge) only needs to operate on 800 and 1900 MHz for CDMA EV-DO Rev. A.

  • Both phones use 2400 MHz frequencies for Bluetooth and 2.4 GHz for WiFi and the 1.575 GHz frequency for A-GPS.

  • Only time will tell if this new antenna design helps combat the reception problems reportedly plaguing AT&T's GSM iPhone 4. However, there is no reason to expect that it would as the problem reportedly does not occur with the GSM iPhone on other GSM networks around the world.

这台机子没有sim卡插槽,根据苹果的说法,在GSM版iPhone4中,sim卡和卡托是唯一可供用户维修的部件,苹果现在说“iPhone不包含任何用户可维修的部件。”我们相信你有权维修自己的硬件,我们会马上提供维修指南。

我们认为手机右侧天线的额外隔断是从GSM切换到CDMA的结果,天线的工作频率直接取决于它的尺寸和几何结构,因此这种改变需要对天线进行大量修改。

GSM版iPhone有三个不同形状的天线,使手机能够在UMTS/HSDPA/HSUPA(850、900、1900、2100 MHz)和GSM/EDGE(850、900、1800、1900 MHz)上进行通信。

CDMA版iPhone有四段天线(顶部和底端是两个U型条,边缘是两个直条)CDMA只需要在800MHz和1900MHz频率下运行

这两款手机的蓝牙使用2400 MHz频率,WiFi使用2.4 GHz,A-GPS使用1.575 GHz频率。

只有时间能证明这种新的天线设计是否有助于解决据报道困扰AT&T的GSM iPhone 4的接收问题。但是,没有理由指望它,因为据报道,在全球其他GSM网络上的GSM iPhone不会出现此问题。

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