List of Android Applications that every android phone must have
1. Barcode Scanner -
Makes small amount of data transfer easier than ever between phone , computer and many more options.
Scan barcodes on products then look up prices and reviews. You can also scan Data Matrix and QR Codes containing URLs, contact info, etc.Also share your contacts, apps, and bookmarks via QR Code
Downloads: 100,000,000 +
Market Link: https://play.google.com/store/apps/details?id=com.google.zxing.client.android
QR BARCODE SCANNER
RedLaser Barcode & QR Scanner
ScanLife Barcode & QR Reader
AT&T Code Scanner: QR,UPC & DM
2.AntTek Explorer (File Manager) - Best file manager that I've found
The most intuitive, usefull and simple to use File Manager on the Android Market. This is the first multi-panel file explorer on Android OS. It features "Drag & drop anywhere" to bring the best user experience.
Downloads: 500,000 +
Market Link: https://play.google.com/store/apps/details?id=com.anttek.explorer
ASTRO File Manager / Browser
AndroZip File Manager - Must have to perform ZIP and UnZip operations.
Root Explorer (File Manager)