Share your experience!
Hi
I have a sony xperia Ion LT28H
After the update to 4.1.2 did not operate the wireless network only after removing the SIM or turn the device into flight mode.
Regards
Jano Naoum
Was this with one particular wifi connection (your home router?) or with any wifi network?
All Wi-Fi networks
Then try resetting the phone or re-installing the software and see if that helps.
Same Problem 