[Q] Unable to scan for wifi

[ImbaWind]

Hi fellows here, today my brother got his brand new Xperia Z, when we got home, I tried to open the wifi to setup his phone for him.
But it just show no wifi connection available (My Nexus 4 has my house's wifi connection and connected instantly)

What's the problem? Any fixes if without root or a unlocked bootloader ? (I tried to search, both Google and XDA)

 

[gm007]

Did you update the software?

Sent from my C6603 using xda premium

 

[glukasil]

hi mate. is there a sim card in the phone? it cant see some wifis without it....also do a reboot