Problem with "add call"

[nik1975]

Hello guys i have an iphone 4 and after j/b in 4.3.3 i have this problem!
When i make a call and i want to add another person in the call,you know i press the tab "add call" and then doesnt open my contacts as it is use to do it in other firmwares but i shows me the homescreen!!!
Do you know what to do?
Is there anybody else how has the same problem??

SOLVED:It was a bug of the cydia pagkage NoVoiceMail!!
Now work perfectly!!