Originally Posted by MidnightDraven
A phone does not "unlock by itself" when you download a new OS.
To unlock it, it requires a unlock code.
As for the problem, try rebooting your router.
Or if you have MAC filtering enabled, make sure you enter the WAN MAC address of your BB into the router's settings to allow connection.
I don't have MAC filtering enabled and I have restarted modem also but no success.
Don't now much about a blackberry phones because for a long time I used Iphone but when I bought the blackberry phone it had a OS 4.6 and I install a OS 188.8.131.521 after rebooting it was unlocked don't know why and I could use it with my carrier.