https://community.bt.com/t5/BT-Mobile/How-to-lock-the-sim/m-p/2317054#M23381 <P>Hi,</P><P>Very important for security to set a PIN….</P><P>Most providers &amp; BT do not set active.</P><P>The default for my BT Mobile SIM was (delivered by BT ) was &nbsp;5555 ( then I changed it - and always use a PIN )</P><P>You can however, via MY BT obtain a PUK code - so if do get locked out - you will need the PUK code to unlock it ( so maybe get that first )</P><P>Cheers</P> Wed, 27 Sep 2023 17:05:43 GMT clever_trevor 2023-09-27T17:05:43Z https://community.bt.com/t5/BT-Mobile/How-to-lock-the-sim/m-p/2316988#M23376 <P>I am trying to lock my sim. I don't remember ever setting up a PIN for this, and I have a new sim from BT, the PIN they sent for unlocking anything doesn't work. I have one try left and I'm stumped. Does anyone know when I this is set up or who I would need to contact to set it up? Tia</P> Wed, 27 Sep 2023 13:27:52 GMT https://community.bt.com/t5/BT-Mobile/How-to-lock-the-sim/m-p/2316988#M23376 Ebag 2023-09-27T13:27:52Z https://community.bt.com/t5/BT-Mobile/How-to-lock-the-sim/m-p/2317054#M23381 <P>Hi,</P><P>Very important for security to set a PIN….</P><P>Most providers &amp; BT do not set active.</P><P>The default for my BT Mobile SIM was (delivered by BT ) was &nbsp;5555 ( then I changed it - and always use a PIN )</P><P>You can however, via MY BT obtain a PUK code - so if do get locked out - you will need the PUK code to unlock it ( so maybe get that first )</P><P>Cheers</P> Wed, 27 Sep 2023 17:05:43 GMT https://community.bt.com/t5/BT-Mobile/How-to-lock-the-sim/m-p/2317054#M23381 clever_trevor 2023-09-27T17:05:43Z