https://community.o2.co.uk/t5/Tech-Support/Locked-SIM/m-p/1492167#M11965 <P>I have several sim card contracts with O2. One of them says Locked SIM in the corner of the phone and I am only able to use the phone on WIFI. How do I unlock the SIM</P> Tue, 28 Sep 2021 18:04:15 GMT Chris6728 2021-09-28T18:04:15Z https://community.o2.co.uk/t5/Tech-Support/Locked-SIM/m-p/1492167#M11965 <P>I have several sim card contracts with O2. One of them says Locked SIM in the corner of the phone and I am only able to use the phone on WIFI. How do I unlock the SIM</P> Tue, 28 Sep 2021 18:04:15 GMT https://community.o2.co.uk/t5/Tech-Support/Locked-SIM/m-p/1492167#M11965 Chris6728 2021-09-28T18:04:15Z https://community.o2.co.uk/t5/Tech-Support/Locked-SIM/m-p/1492168#M11966 <P><a href="https://community.o2.co.uk/t5/user/viewprofilepage/user-id/3954533">@Chris6728</a>&nbsp;</P><P>Try your PUK&nbsp;<A href="https://www.o2.co.uk/help/phones-sims-and-devices/unblock-your-phone" target="_blank">https://www.o2.co.uk/help/phones-sims-and-devices/unblock-your-phone</A></P> Tue, 28 Sep 2021 18:09:22 GMT https://community.o2.co.uk/t5/Tech-Support/Locked-SIM/m-p/1492168#M11966 MI5 2021-09-28T18:09:22Z