I have an iPhone 3Gs bought from a yard sale, original owner unknown. While I have no interest in using it as a phone, I do want to use it as a portable wifi device. However, in Settings, wifi is missing. Not greyed out, but completely missing. In the section where it should be, I have just Airplane Mode and Bluetooth, and nothing else. I have tried resetting all network settings. I have tried jailbreaking and unlocking the phone. I have tried it with a sim card from another carrier. Nothing seems to make a difference to the device; the option is still missing. I have searched a host of sites for info related to this, but have not been able to find that anyone else has had the same problem, let alone having a solution. Can anyone provide assistance or insight into this problem? For technical reference, it is a 16 GB 3GS running IOS 6.1.3 with Modem Firmware 05.13.04. It is not currently jailbroken, as I reset it to update the OS. For all the good that did.