https://community.o2.co.uk/t5/Pay-Monthly/Upgrade/m-p/1550834#M245325 <P><a href="https://community.o2.co.uk/t5/user/viewprofilepage/user-id/4861043">@Hannah282</a>&nbsp;</P><P>You can use your old sim or activate the new one if you can get the use of 5g.</P><P>Do a sim swap which with keep your number on the new sim <LI-PRODUCT title="Guide: Sim Swap: a mini guide 2017 update" id="Guide012"></LI-PRODUCT>&nbsp;</P> Thu, 19 May 2022 19:16:59 GMT MI5 2022-05-19T19:16:59Z https://community.o2.co.uk/t5/Pay-Monthly/Upgrade/m-p/1550832#M245324 <P>Hello, I’ve just upgraded my phone which arrived today. However it came with a new SIM card and I was just wondering if I need to use the new one or old one? If I need to use the new one will my number be the same? Kind regards Hannah&nbsp;</P> Thu, 19 May 2022 18:59:51 GMT https://community.o2.co.uk/t5/Pay-Monthly/Upgrade/m-p/1550832#M245324 Hannah282 2022-05-19T18:59:51Z https://community.o2.co.uk/t5/Pay-Monthly/Upgrade/m-p/1550834#M245325 <P><a href="https://community.o2.co.uk/t5/user/viewprofilepage/user-id/4861043">@Hannah282</a>&nbsp;</P><P>You can use your old sim or activate the new one if you can get the use of 5g.</P><P>Do a sim swap which with keep your number on the new sim <LI-PRODUCT title="Guide: Sim Swap: a mini guide 2017 update" id="Guide012"></LI-PRODUCT>&nbsp;</P> Thu, 19 May 2022 19:16:59 GMT https://community.o2.co.uk/t5/Pay-Monthly/Upgrade/m-p/1550834#M245325 MI5 2022-05-19T19:16:59Z