My iphone 3gs screen is frozen?

I was just using it normally & the screen froze when i was on the app THUMB, and it won't work! The screen is dim and frozen, it won't turn off, it won't let me exit the app, its just completey frozen and it has been this way for like 20 minutes, what do i do?

This might not work, but hold the power and home buttons at the same time until the phone restarts, hopefully it works, but if it doesn't, you might need to replace the digitizer.

Take it to the Apple Store and get it repaired.

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