HT204023: Share your Internet connection with Personal Hotspot
Learn about Share your Internet connection with Personal Hotspot
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Feb 20, 2014 9:58 PM in response to SusanFrancesby Jay-Ray,A SIM PIN, also referred to sometimes as a PUK Code is like a PIN number for your SIM card (just like your ATM Card). Since your SIM card has your cellular account on it and can be typically removed from one device and put into another, you can lock the SIM Card with a SIM PIN if you choose. If you activate the SIM PIN feature and forget your SIM PIN when you try to re-activate your device or a new device in the future using the same SIM Card, you may have to contact you carrier to get a new SIM Card. http://support.apple.com/kb/ht1316
As far as changing the SIM Cards out because you want to use a new carrier, you can remove the SIM card fomr the old carrier and put in the SIM card form the new carrier. http://support.apple.com/kb/ht5163
I hope this helps clear things up.