Sprint Nextel 755P ユーザーズマニュアル

When you open an application using either a quick button or Applications view, you 
automatically close the application you were previously using.

The front of your device has three buttons that you can use to open specific applications. 
The fourth button opens Applications view, which allows you to access all the applications 
on your device. You can also press any of the quick buttons or the Applications button to 
wake up your device screen. 

Each of the three quick buttons opens an application. When you press Option  

first, 

each 

quick button opens a secondary application. 

Phone

 + 

 Web

Calendar

 + 

 World Clock

Messaging

 + 

 Email