Will all data be removed if i erase all content and settings , should I remove the SIM card
Will all data be removed from my iPhone 6 if I erase all content and settings, should I remove the SIM card?
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Yes, all data will be removed if you erase all content and settings. What is it that you are trying to do, sell, give away, or turn in iPhone? If so, make sure you follow all of the steps in this support document, What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
Yes, remove your SIM if you are getting rid of the device.