1. If any unknown number call on my phone, the phone should not ring usually it will when contact is saved.

2. Can the unknown call be picked in background without noticing and a pre-recorded voice should be spoken to person opposite side.

Please mention if can be done on both iOS and android or anyone or none.

Thanks for Help.

CodePudding user response：

Both operating systems will not allow you to do that. 1st point is somehow possible in Android but 2nd one is almost impossible to do in both platforms. Apple dont allows to intercept most of their system APIs by some 3rd party