Upgrading to 5G

[Michael8]

Hi, 

I recently chnaged from Virgin to O2. i currently have an IPhone XS Max and my sim is a 4G pay monthly. 

I am expecting the IPhone 12 PRO MAX to be delivered on the 13th of January, this has 5G cabability on it. Do i need a new sim or will my Sim just change from 4G to 5G when i put it in my new phone ? 

[Bambino · Accepted solution]

@Michael8 Your 4G sim will work. You would only need a 5G sim if you were in a 5G area. If you are, you can do a sim swap.  SIM Swap: a mini guide (incl eSim) - O2 Community