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My wifes contacts keeping going away on her phone after we restore it. The phone was mine and when I upgraded it she took mine and gave her lder iPhone to our son. Can it be a sim card issue or is there a setting I need to change? I am at a lost here.
No, it cannot be a SIM card issue because iPhones do not store contacts on the SIM.
Where are the contacts stored? Are they synced to a supported application on the computer? A cloud service like iCloud or Exchange? Or does she simply relay on the device as the single source (this is a really, really bad idea)?

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