Question

I have an iPhone

Answer 1

It is recommended to use a dedicated router for such a setup. 

Please review the following Knowledge Base articles for routers. 

Link: https://support.presonus.com/hc/en-us/articles/210047813-Are-there-any-specific-routers-that-are-NOT-recommended-to-use-with-the-StudioLive-AI-mixers-

Link: https://support.presonus.com/hc/en-us/articles/210047823-Are-there-any-specific-routers-that-are-recommended-to-use-with-StudioLive-family-mixers-

Answer 2

I assume you are trying to use your phone as a Hot Spot?
I think you will find that it will work but I wouldn’t count on it for stability.
Prior to getting a dedicated router I used a Verizon MIFI which would be the same basic idea.
Just an FYI, you really need a router to set up a wireless network, not internet access