Phone Call Icon Missing Iphone 4?

I have a jailbroken iphone 4 with IOS 5.0. And it was working fine for almost a year until i started downloading apps with Cydia. My phone call icon is gone and can't get it by resetting all setting or resetting home screen. I backed up my iphone from icloud to a week before the phone icon disappeared. I noticed it was gone after i did an update to all apps in the App Store without paying attention to the apps being updated. The weird thing I'm still able to text contacts but can't call. How can i get the folder back?

Added (1). Well if i unjailbreak it will that affect my wireless service use? I'm with AT&T?

Hold the lock button, and home button down at the same time for 10 seconds. If that doesn't work, I suggest unjailbreaking, sorry!