Tips and stuff you won’t find in the manual, collected from the xda-developers forum, personal experimentation and other sources. Please use only tips you understand – if you don’t know what a factory reset means, you do not want to find out :)

Explanation

„Pinch“ means using 2 fingers to zoom in our out (Google this if you don’t know the word). The buttons are depicted here:
Samsung Galaxy SII buttons

User interface

Home screen

Android Apps

(Forum link: Feature discoveries – xda-developers)

Miscellaneous hints

Factory reset (Everything will be deleted!)

Via these three ways:

  • Turn phone off, press and hold: volume Up + home + power. Use volume keys to navigate up/down, home to execute.
  • In the phone keypad: Enter *2767*3855#
  • Menu: Settings > Privacy > Factory data reset.

Codes (enter via phone keypad, the ones below work for me)

*#0*# LCD Screen test
*#06# Show IMEI Number
*#2222# HW Version
*#1234# Phone info
*#34971539# Camera Firmware
*#9900# Sysdump (Logfiles etc.)
*#0228# Battery diagnostics
*#7284# Phone utility
*#7353# Function testing
*#9090# Service Mode
*#*#197328640#*#* Service Mode Menu
*2767*3855# Factory Reset (not tested.. :)