how to know the ID needed for iphone to be activated, how to know the ID needed for iphone to be activated

Find My iPhone Activation Lock

You must find the prior owner to unlock the activation lock. No one else can do that for you. Without that the device is useless. Return it to the seller for a refund, if possible. Otherwise, you've been conned.

Asking the same question over and over will not alter reality. Your question has already been answered ad nauseam in your other thread and the answer is the same:

need help

Repeating the same experiment time after time because you think you will get different results is Einstein's definition of insanity. 😁

orumejude wrote:

i have the previous owner's id and password bt it say the id can unlock phone those it really disturb wen two phones use the same apple id to activate

This makes no sense at all.

Please post in complete thoughts/sentences and punctuation.

If you look at the OPs earlier nonsensical response to you, you will see that he is perhaps already insane 🙂