It's nice to have you aboard...You could check over the http://www.androidcentral.com/samsung-infuse-4g to see if anyone can assist you with this problem. Also, In my signature there's a "Getting Started-Link" - Make sure to Click/Tap on it...It has lots of good information...from there you can find hints, tips and tricks for your Android device.
There are members here who are willing to help 'YOU' with any question(s) or concern(s) you may have.
I hope you find AC forum informative and prove to be useful! See ya around.