, I'm experiencing connection problems between my iPhone 7 Plus and Remote Controller. I also tried to use an iPhone 6s Plus but once I plug in the supplied cable, the Remote Controller loses connection with my iPhone.

I tried using another non-apple phone, and the connection did not lose.
Probably depends on the cable inside the box.

In this way the drone is not usable, I lose connection often and sometimes my iPhone 7 Plus does not connect with the drone.

Thanks very much for your support.

There's a thread about it already so feel free to browse through that: https://forum.dji.com/forum.php?mod=viewthread&tid=72870

Try using the cable that came with your iphone and plug it into the usb port on the bottom of the remote controller and see if that works.

Ok thank you I try to connect USB port.

Yes, please try the bottom USB port to see will it work. If you can connect the mobile device via the bottom port, then it might be the short lightning cable's issue,  please contact our support for help.
Clic here to contact us: http://www.dji.com/support.
Thank you.