@Nath9
One will need to provide further information on which Sky router... If an iPhone detects that the wireless is weak and the mobile signal is better then it will disconnect from the wireless and use the mobile network. There is a setting on the iPhone that stops the iPhone from disconnecting in this case and using wireless always, even when 4G/5G is better the setting is Wi-Fi Assist and should be disabled under mobile services in settings on iPhone.
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Zen internet on FTTP (900Mbps down, 100Mbps up). SAT> IP (Apple 4K 2nd gen TV to LG C1 OLED UHD TV/Dolby Atmos Denon AVR, DacMagic Plus for Hi-Res audio), hosting own blog/forum (cluster), OPNsense & Zenarmor L4/L7 NGFW & DPI IDS/IPS, Asus ET12 Pro Tri-Band wifi, Linux, Gamer: Xbox Series X/i7 laptop, round-robin DNS over HTTPS, non-proprietary VoIP HD AMR-WB (G.722.2) and more... Beta tester Apple iOS/watchOS/tvOS/iPadOS/macOS.
