Can i use an iphone 6s plus without a sim card if i already activated it using a simcard?

Can i use an iphone 6s plus without a sim card if i already activated it using a simcard? - 1

Yes but you will not be able to make phone calls or use data to browse the web unless you have Wi-Fi

Nope.

Yes but can't call or text or go online without sim card

Yea, though I don't see the point of using an iPhone as an iPod touch.