Even without service, Android phones make great WiFi devices. You can do everything - take photos/videos, make voice calls, send SMS/MMS, interact on social media, watch video, listen to music, read ebooks, etc. Cellular service just fills in the gaps, if you are in a dense WiFi area. They also make great wireless displays for things like Raspberry Pi projects; just install a VNC or X Windows app, and you're off.
I like the case design finish on this device. It's beautiful.