One thing that's great about the GN phone is that you can swap out the batteries to obviate the need to carry around a portable battery. You can't do this with the N4 (can't take off backplate) or the N5 (you can take off the backplate, but there's a metal brace holding the battery in place).
My friend still has his GN phone from its original launch and carries 2 extra batteries with him at all times (he's a real estate broker so he needs to always be available via phone)
My friend still has his GN phone from its original launch and carries 2 extra batteries with him at all times (he's a real estate broker so he needs to always be available via phone)