Most people use a passcode to protect their iPhone (if you don’t, you should), but few enable the SIM lock. If you’re unlucky enough to lose your phone or it’s stolen, it’s not only the hardware that could fall into the wrong hands. Your SIM might contain data and contacts, as well as allow someone to spend money via text messages. Here’s how to enable the SIM lock.
How to stop the iOS 9 hack
Anyone who finds an iPhone with no passcode will be able to access lots of content stored on the device: contacts, music or documents.
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