It is finally happening, folks! If you're a T-Mobile customer, get your Samsung Galaxy S II devices charged up because tonight is the night the official Android 4.0.3 (ICS) update goes live for your handset. T-Mobile has released a post through their support channels informing us all that the update will go live tonight at 11PM EST/8PM PST. The update will take place through Kies which means there will be no over-the-air update.

This is a great announcement for T-Mobile SGS2 users. Do note that if you are using a rooted SGS2 running a custom ROM you will have to revert to stock to complete the update. If you wish to take the official update but are running a custom ROM, the process to revert can be found HERE. Many of you have already rooted your SGS2 and installed a custom ROM to get ahead of the release; if you haven't, you can find a multitude of ROMs and tweaks in our Samsung Galaxy S II forums.

Are you looking to update your SGS2 to the Stock Android 4.0.3 update or are you going to stick with a custom ROM for your ICS fix?

Prerequisites before Updating (Altered for more information & links)

• Kies by Samsung (PC & Mac)
  
• Data Cable
  
• Samsung Galaxy S 2 for T-Mobile running Stock Android version 2.3.6 / Software version T989UVLDE
  
• At Least 50% battery level

Android version 4.0.3/ Software version T989UVLE1 - Current optional update version:

Version

• Android version 4.0.3/ Software version T989UVLE1
  
• Manual Update ONLY (Size varies based on previous software version)
  
• Approved 6/11/12

Improvements

• Android 4.0 Ice Cream Sandwich (ICS)
  
• CMAS improvement
  
• Wi-Fi Calling enhancements
  
• Voicemail enhancements