I would like to know if T-mobile users has experience any issues upgrading to 4.0.

The upgrade to 4.0.0.198 went pretty smoothly, minor issue with the Instant Messanger client but was easily fixed. The number one problem I'm having after the upgrade is that the volume of my BlueTooth headset dropped by at least a third. Other companies have released new versions of 4.0 but for some stupid reason I've been waiting for TMobile to get with it.

My upgrade to 4.0 went very smoothly. All of the applications worked great, email remained solid and of course, the phone was great. Also, as I am sure you have read from people far more experienced than myself, with 4.0, you can get Verichat, Reqwireless Webviewer and many other great Applications.

If you are thinking about getting any applications, I have included some pointers below, for correctly configuring the apps.

THESE ARE NOT THE DOWNLOADS, BUT RATHER CONFIGURATIONS!!!!!!!!!!!

Reqwireless Webviewer Personal Edition: http://www.reqwireless.com/support_bb_wap.html

Verichat Configuration (POSTED and COPYWRITTEN BY MARK REJHON)
BlackBerry Internet - MSN/chat/web/telnet/TCPIP - No BES!

Clearing Email to Optimize memory/mailbox space
http://www.tmobile.com/bwc/