Q: i puchase a phone that is linked previus ower i cant active my phone

You must contact the previous owner, there is no alternative.

Then there is nothing you can do, try to get a refund.

Read my earlier posts.

You're welcome.

Without the previous owner's details, your iPhone is useless.

It seems that you updated to iOS 9.3 before this happened. Apple has released a newer build of iOS 9.3 that might fix your problem. Update it in iTunes.

when apple launch new ios9.3   .  my phone is locked   any idea to open appleid and password of old user