I used iPhone to set World Clock at Clock tonight. I want to add more cities after 4 cities are set. But once I tap the (+), it returns Springboard. I tried to find out at
Setting-->Date&Time to see any problem there. The first time is still ok, once I tried second time, it returns Springboard.

Now, once I chose Clock or Setting-->Date&Time , it will return Springboard.
(I have installed Summerboard and many applications, did they affect the Clock function at iPhone)

Any suggestion? I am using firmware 1.0.2. using unlock method suggested by carlosvaldosta.

Please help me.

I find a file called MobileTimer.app at Application directory of iPhone.

Can I ask my friend who is using iPhone to copy their MobileTimer.app
in order to replace mine? then it can work again?

Please help me if anyone knows the solution....
Many thx!