Please help. Setup/connection through cellphone Internet?

[ntcaldwell]

I have an
ezviz Husky CV-210

• 1920 x 1080 Resolution at 30 fps
• IR LEDs for Night Vision Up to 100'
• 4mm Fixed Lens
• 107.5° Diagonal Field of View
• microSD Slot Supports Up to 128GB
• Wi-Fi Connectivity for Easy Installation
• RJ45 Ethernet Connection with PoE
• Live Viewing on Mobile Devices/Computers
• ezviz App for iOS and Android
• IP66-Rated for Outdoor Use

Here at home we don't have regular internet service. I simply use my phone's tethering capability. Everything out there says I have to use Internet to set this thing up just to get it to start recording.
I have a POE switch coming in a few days.

What I'm wanting to do is connect this thing to the ethernet input of my laptop, use my external hard drive to save video and photo, and use the Internet from my phone without paying a monthly Internet bill to get it set up. Is it possible to bypass the Internet setup or use my phone's Internet and, if so, how?