how do I reset my iphone 4s back to factory settings
My wifi button has locked up therefore I cannot use my home wifi.
iPhone 4S, iOS 8.1.2, my wifi button has 'locked' up
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There are two different restores. First, there is restore from backup, then a restore as new. Both are listed in iTunes Summary page, Restore is the restore as new. Restore Backup will restore a backup you choose. You can also look at this support document about Wi-Fi problems. iOS: Wi-Fi settings grayed out or dim - Apple Support