Yes, there is an unlocking code for usim, and for this case you need lg cyon unlock code for your carrier network. This lg unlock code is unique and binding on single device but you can purchase that unlock code for small price at online unlock code retailer on internet.
Try to reseting your phone in default factory setting, if didn't work call your network provider and request LG Cyon unlock code for sim message not lg unlock code for other network. The easy way just change your sim card :D
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