Default [Q] slimbean 3.0 (JB 4.1.2) replacing stock contact apk

Hi,

I just updated my AT&T Samsung infuse to this rom (slimbean 3.0 JB 4.1.2) and it is wonderful! The only thing that I do not like is the stock contacts app with this rom. I am trying to flash the Samsung secphone apk from my S2 but after deleting the old one with root explorer and giving the new one permission all I get after reboot is "could not launch requested activity." Is there any way to go back to the contact app that all Samsung phones use? I like the Samsung contacts app because it shows if my contacts have whatsapp, skype and other messaging apps installed on their phones.

Thank you for any useful information.

Giovanni