1

Turn on your jailbroken iPhone and go to the home screen.
2

Tap the "Cydia" icon and go to the "Search" section. Type "Installous" in the search field and touch the "Search" button.
3

Select the "Installous 4" if your iPhone is running iOS 4 or choose "Installous 3" if your iPhone is running iOS 4 firmware.
4

Tap the "Install" button and on the next screen touch the "Confirm" button. Cydia will install the Installous app on your device.

5

Go to the iPhone's home screen and tap the "Installous" icon.
6

Touch the "Settings" button at the top and move the slider for "Install automatically" and "Delete automatically" to the "ON" position. You may also want to enable the "iTunes Sync" option. Press the "Done" button.
7

Tap the "Browse" or "Search" icon at the bottom to locate an iPhone app you want to install.
8

Tap the "Download" button and select the download source. Each source has different prompts on its website, so you will have to tap a few more buttons to get the IPA file. The file will download and install automatically.
9

Go to the home screen and find the iPhone app you just installed. Tap the icon to launch the application.[align=center]