My home WiFi network is not detected at all on my Nexus 4 (lollipop). I've got no problem connecting with my laptop.
What could be the reason?
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I had the exact same issue with my Nexus 4 after the Lollipop update.
Rebooting the phone will fix this temporarily, but only for a few hours from my experience.
So far there is only one thing that has resolved this issue for me - I replaced the stock Lollipop with Cyanogenmod, using these instructions: