For those who cannot display the logo. Please try one of these :
(1) Install another set. For example, uninstall it and install BW version
(2) power off the iPhone, takeout the sim card, power on the iPhone and put in the sim card back while the iPhone is on.
For those who know how to use Putty or Terminal
Please type these 3 commands and see what would you get
ls -l /var/mobile/Library/*.bundle
ls -l /var/mobile/Library/Preferences/*carrier*
ls -l /var/mobile/Library/Preferences/*operator*
23733-app.zip