https://community.o2.co.uk/t5/Apple/iPhone-12/m-p/1460303#M167485 Got the iPhone 12 - inputted the new 5G SIM &amp; transferred all the data from my iPhone 10. All there &amp; working however it won’t allow me to ring anyone &amp; when someone rings me my old iPhone 10 is still connected? Do I have to do anything with the original SIM which is in my old phone? Tue, 18 May 2021 19:28:58 GMT Amy19 2021-05-18T19:28:58Z https://community.o2.co.uk/t5/Apple/iPhone-12/m-p/1460303#M167485 Got the iPhone 12 - inputted the new 5G SIM &amp; transferred all the data from my iPhone 10. All there &amp; working however it won’t allow me to ring anyone &amp; when someone rings me my old iPhone 10 is still connected? Do I have to do anything with the original SIM which is in my old phone? Tue, 18 May 2021 19:28:58 GMT https://community.o2.co.uk/t5/Apple/iPhone-12/m-p/1460303#M167485 Amy19 2021-05-18T19:28:58Z https://community.o2.co.uk/t5/Apple/iPhone-12/m-p/1460308#M167486 <P><a href="https://community.o2.co.uk/t5/user/viewprofilepage/user-id/4489418">@Amy19</a>&nbsp;</P><P>You can use the old sim in the new phone or if you want to use the new sim, do a sim swap from your old sim to activate it <LI-PRODUCT title="Guide: Sim Swap: a mini guide 2017 update" id="Guide012"></LI-PRODUCT>&nbsp;</P> Tue, 18 May 2021 19:46:24 GMT https://community.o2.co.uk/t5/Apple/iPhone-12/m-p/1460308#M167486 MI5 2021-05-18T19:46:24Z