Check in the web browser whether wifi is on/off. Connect to the wifi via the web browser. 

Now there is also a connection on the mobile phone.

If this still does not work, you can give your camera a port forwarding in your modem over port 80 with a UPD protocol.

Turning on UPNP in the modem may also offer a solution.

If you have any additional questions, you can always contact us via this website.

Please state the complaint clearly so we can help you.