iPhone Auto connecting to Spectrum WiFi but never had TWC or Spectrum?
Why is my iPhone automatically connecting to Spectrum mobile WiFi in stead of my regular Spectrum WiFi?
iPhone 12 Pro Max
Did you contact Spectrum for help? iPhone has no role to play. Spectrum Customer Service, Phone Number & Chat
Before you contact Spectrum try this...
Tap Settings > Wi-Fi. Tap the More Info button next to the network name. Make sure that Auto-Join is on.