The PIN protects your SIM from unauthorised use if your tablet should get stolen. If use of PIN is turned on, it needs to be keyed in when you turn on your tablet.
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Press Mobile Data.
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Press Mobile Data Options.
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Press the indicator next to "SIM PIN" to turn the function on or off.
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Key in your PIN and press Done. The default PIN is 1111.
If an incorrect PIN is entered three times in a row, your SIM will be blocked. To unblock your SIM, you'll need to key in your PUK. The PUK can be obtained by contacting customer services. Please note: If you key in the wrong PUK ten times in a row, your SIM will be blocked permanently. In this case, you need a new SIM from EE.