If the Samsung C3053 (also known as Samsung GT-C3050, Samsung C3050)shows invalid Sim ,then there is a chance that the phone's carrier is locked to a particular network. If you want to unlock the Sim Lock safely ,you can use unlock codes. You can get the unlock code from OnlineGSMUnlock.com . There you have to give your Country and current network name along with your IMEI number to get the unlock code. They will give you the unlock code along with instruction on how to unlock. Follow the instruction correctly and unlock the Sim Lock of Samsung C3053.
SOURCE: how to unlock samsung gt-s3350 for invalid sim problem
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