Which application is responsible for phone function?

[sam20022020]

Hi Guys,

I am new to android I want to know in android which application is responsible for phone function?

[libin]

I too had been wondering what was the application in android that managed the entire mobile system. It seems to me that there are numerous apps behind the full functioning of the android system. Furthermore, it keeps changing with the updates that are often released which make it hard to sort out.Which is the best application for text marketing (http://www.eztexting.com) purpose? any reviews on any applications?

[sam20022020]

I have Dell Streak 7 tab and i have GMS unlocked feature. but i am unable to call using this so i want to know how to activate these feature?