Hi I bought a second hand iPhone 3 years back. So I can’t find the previous owner for activation so what do I need to do.

mamosa176 wrote:

It’s locked to owner. After I reset it. iPhone 7

If you cannot contact the previous owner, the phone is useless to you. Recycle it responsibly.

And, ignore items 2-5 and 7 in the post above. They are completely irrelevant to your situation. Chatbot at work. .