Replacing my default phone application with other one Can I replace my phone.apk from system/app to a new Phone application such as Swipe Dialer Pro . will it do any harm.there is also one additional apk in system/app called phone service. Apk. what's the purpose of that. I'm on android 4.1 rooted with CWMR.
Bro I'm trying to do it .. But there is only one way I found .. Just download some system app installer apk and install it .. 
Then get phone.apk and contact.apk from any custom ROM which is for your device and install them using system app installer ... That's all you can do .. I've tried a lot to find the way but it didn't work .. 
Good luck