Can anyone tell me how to setup my system to get the fastest speeds on iPhones?

[frank_perricone]

Trying to learn how to set up my system to maximize the 1000/1000 speeds I now get from my cable provider. My iPhone only seems to get 125-160. 

I have a Zone Director 112 and 8 AP's (4-zf 7372 & 4-zf 7363) 

Thank you