New phone & 5g

[Brighteyes74]

Hello
I recived my new phone today s20 plus with a new 5g sim. Do I use the old sim or the new one.
Also how do I keep the same number as I was already on o2.
Help please

[Bambino]

@Brighteyes74 You can carry on using your old sim or swap it. The swap system has had problems of late, so you should stick with the old sim for now. If you're in a 5G area and it's up and running you can try to swap, but if you're not, I suggest you wait until things settle back down. 

https://community.o2.co.uk/t5/How-to-Guides/SIM-Swap-a-mini-guide/ba-p/1060675