activation code or id

If you are the owner or the owner has shared all information with you then to open Activation Lock:- If it is Activation locked, read here --> Turn off Activation Lock - Apple Support Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Learn how to remove a device from a previous owner's account.

If you are not the owner and do not have the Apple ID and Password then there is no way that you can get into this iPhone unless the original owner shares the Apple ID and password with you. If you are lucky you can get into this iPhone if they (owner) accidentally remove the device from their Apple ID.

Without the Apple ID and Password with which your friend set up the phone, you will not be able to use it. This link contains the steps your friend needs to take so that you can use the device...

What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support

This link describes the steps to clear Activation Lock....

How to remove Activation Lock - Apple Support