Tablet [Q] Samsung Galaxy Tab 2 (P3100)

Guys, i need help, i recently rooted my device to Jellybean 4.1.2 from a specific website, after downloading the filoe which is about 700mb, installed it on my phone, everything looks great until i notice that im unable to make phone calls, dialer and phone apps are not on my device anymore, texting or messaging app is still there but calling feature was removed.

I would really appreciate any help.. Thanks ..