May you please help us to active an [iphone 6+] without icloud account

If you are the owner of the iPhone 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 of the iPhone 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.

If you have an iPhone you did not buy originally, you have to ask the previous owner to remove the phone from their iCloud account. If you don't know them or can't reach them you have a COMPLETELY USELESS iPhone. Apple will NOT help you. We CANNOT help you. The ONLY person who can help you is the owner who set up the phone.

The Serial number nor IMEI number will NOT help you in any way.

See this link about used iOS devices --> The All Too Common SAD Reality of Buying … - Apple Community