I forgot my passcode to my phone because my friend changed it. I'm not locking it, so I can still use my phone. The computer my phone is backed up on is down right now. Is there any way I can go to the apple store and have them unlock my phone? Or any way to take my passcode off besides resetting it on my computer. That option is not possible right now. Thanks.
You'd have to restore the phone using iTunes on a Mac or PC
To do that, turn off your phone, than plug your phone in (to the computer) while keeping the home button pressed until an iTunes symbol appears on the iPhone's screen. iTunes should "detect a phone in restore mode" and you'll be able to reset your phone.
Apple Article on the topic: http://support.apple.com/kb/HT1212?viewlocale=en_US&locale=en_US