Try making the iPhone forget the WiFi network, then reconnect and re-enter the password. More often than not it's a device issue (i thingys are known to not play well with Sky kit and be niggly).
If that doesn't work, try turning the hub/router on and off again. Failing that do a hard reset of the router with the button hidden in the back with a small pen/pin.
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Zen Superfast (FTTC), Fritzbox 7530, Sky Q 2TB UHD v3 (x1), Sky Q Mini (x2), Alienware Area 51-M, Panasonic TX-65HZ1000B, Denon AVR-X6300H, B&W CM8 S2, B&W CM1 S2 (x2), B&W CM Centre S2, REL S3 SHO (x2), Panasonic TX-P42G30B, Monitor Audio RS6, Marantz PM7001 KI, Denon HEOS 1 HS2 (x2), B&W P7, iPad Pro 12.9" (5th Gen), iPhone 14 Pro Max, iPad Mini 6 (work)
** No - I have nothing to do with Sky **
