I searched around the whole internet and cannot find the answer how to keep my LG Optimus S wifi working when it is locked. However, I fortunately found the settings from my phone. If the issue is annoying you as well, haha, you come to the right place. I’m going to share this tip on this thread, good luck, buddy. LG Android Phones
Now open your LG Optimus S and follow the steps: from the home Screen, hit Menu key>Settings>wireless and networks>Wifi settings> in this screen hit the Menu key click advanced>Wifi Sleep policy, and select Never.
Okay, now your LG Optimus S will keep working though you locked your phone up. This tip works on any other LG device which runs Android OS, like LG Optimus T, Optimus One and etc. LG-Optimus info
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Thank you…much better