https://forums.windowscentral.com/e?...token=wHh8WKVz
Have a look at note 2 it says 365 subscription needed for some Office features.
So to the OP, yes you can use the mobile apps to create/edit Word and Excel docs, but if you are serious about using a phone to replace a laptop, I would look at Continuum with a 365 account, a small Bluetooth keyboard and mouse set, a docking station, then all you need is an HDMI screen or one with Miracast and you have an almost full blown PC in your pocket experience.