1. Please search UCon in the manual QR code or Google, and download the APP to your phone; 2. Insert the SIM card into the hunting camera, insert the battery and turn on the camera; 3. After the status indicator always turns blue, start to connect the device on the APP: click Add Device - install the 4G device - click Next - scan the QR code on the hunting camera body - wait for the device to be added successfully Translated with www.DeepL.com/Translator (free version) 

Yes, you can attach the phone lens to the main phone camera of iPhone 13. 

No this is a stand alone device, it does not require any other devices to work. It comes with a mini memory card that you can remove and put into a computer to add pictures to charts. That is the only way to get info off unless you snap a picture of the picture with your iphone which honestly is probably faster 

The part for that use is extendable so can fit most phones but this part of the monocular is absolute rubbish. It scratches the phone and just doesn't work for that purpose at all. The actual monocular is very good though if you want to use it normally. 

Yes, you can with the attachment they include.