Hello,
I am having problems with conesting my Iphone 6s (I OS 13.1) with my P4 Pro+ over DJI go4 app. When I run the application on my phone I can always see on the upper left corner ''Disconected'' and I can not update my P4.
Can somebody help me with this problem,
thank you...

Hello and good day sasa023. I am sorry for the trouble this has caused. Please try to link the link the remote controller on DJI Phantom 4 Pro to see if the issue will still persist? Also, you may try to use a different communication cable when connecting the mobile device to the RC for us to check if you still experience the issue. I will be posting an official DJI tutorial video below  where in it will show you how to link the Remote Controller on DJI Phantom 4 Pro. Please keep us posted on the said issue for us to be able to help you further. Thank you.