If you would like to download applications onto your BlackBerry Curve, all you need is a BlackBerry ID and an internet connection on your phone (via WiFi or an internet data plan).
Download and Install BlackBerry Applications
Before you can begin downloading your applications, you must first download BlackBerry App World. Once installed, BlackBerry App World will give you access to all of the applications available for your phone.
BlackBerry App World Installation
Go to Menu > Browser and click on Visit BlackBerry App World. Select the Download BlackBerry App World link and then click on Download Now.
Next, select your language preference and accept the terms and conditions. The download will start automatically.
Your phone should now be ready to install applications.
Download BlackBerry Applications
Launch Blackberry App World and search for the application you'd like to download. Select the application in the results list.
You will be prompted to login with your BlackBerry ID. Enter your information to begin the download process.