Most cell phone users only use the dialing and address book functionality and quickly get lost if they try to access other functions.

他们若试图使用其他功能，则很容易迷失在层次结构的菜单中。

youdao

If your phone is lost or stolen no one can access your address book.

如果您的手机丢失或被盗，没有人能够访问您的地址簿。

youdao

The phone book can also limit access of incoming SMS messages, which can read and write data as well as control outputs.

电话簿也可以限制接收到的短消息的访问，它可以读取和写入数据，以及控制输出。

youdao

Similarly, he says, hackers can write short programs to access a device's internal phone book, initiate or respond to a call, or do whatever else a legitimate user could do.

CNN: Virus protection coming for wireless users

Once in, researchers have full administrative access over the phone allowing them to listen in on room audio or snatch the SMS log, address book, call history, email passwords and more -- we're talking full access to your phone.

ENGADGET: Safari exploit gives hackers full control over iPhones and possibly PCs and Macs

Instead I would just buy a kindle book which I can access on a computer or phone with one purchase and when I upgrade my phone, I just uninstall the app on the old one and install it on the new one unlike apps like Skyscape.

FORBES: Unhappy With Slow Growth Of Android App Purchases, Google Talks 2011 Roadmap