Q: Can the camera also be used without internet and router via direct connection to the mobile phone?
A: No, you would unfortunately always need a router in between. So you can, for example, use a mobile small router which you turn on. The camera can then connect to the router via LAN or WLAN and your smartphone also connects to the router. The advantage is also that you can use a mobile router with SIM card so as to access the camera while on the go if you are. in a hotel etc. are.