Skip to content If you receive an iPhone which has an unknown PIN number you will need to wipe and reset it. The... Here’s a tip for iPhone users. If you have connected your iPhone to your Windows computer and can see the... This process details how to manually set the security PIN on an iPhone 3GS. From the main menu, select ‘Settings’... This process details how to disable the ‘WiFi’ available prompt on an iPhone 3GS.With this option enabled the phone will... This process details how to connect an iPhone 3GS to an Exchange Mailbox. From the main menu, select ‘Settings’ Then... This process details how to restore an iPhone 3GS to its factory defaults From the main menu, select ‘Settings’ Select...