Is it possible to customize or extend the functionality the Phone/contacts application on android phone -

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i want customize contacts or phone application on android mobile. instance adding more details while creating contact. adding additional button screen displayed when contact selected. button should trigger custom functionality.

a programmer can create separate application managing contacts has features seek.

i want customize contacts or phone application on android mobile.

there ~1.5 billion android devices in use, spanning thousands of device models hundreds of manufacturers. there dozens, if not hundreds, of built-in "contacts or phone applications" on devices. cannot extend of them, unless happen have api allow that. not aware of do.


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