SIM 1 not provisioned

[Senpai]

I had my Samsung Galaxy S20+ delivered this morning, got it all unboxed and put my new sim into the phone. Turned it on and did the initial setup. Only to find that I'm receiving a message that says 'SIM 1 not provisioned.' I'm not sure what this means, but it's apparently stopping me from being able to really do anything in terms of texts/calls/data.

[Bambino]

@Senpai  You can use your old sim if it's the same size. If it isn't, you can do a sim swap: https://community.o2.co.uk/t5/How-to-Guides/SIM-Swap-a-mini-guide/ba-p/1060675

[MI5 · Accepted solution]

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@Senpai wrote:

I had my Samsung Galaxy S20+ delivered this morning, got it all unboxed and put my new sim into the phone. Turned it on and did the initial setup. Only to find that I'm receiving a message that says 'SIM 1 not provisioned.' I'm not sure what this means, but it's apparently stopping me from being able to really do anything in terms of texts/calls/data.

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@Senpai 

If this is an upgrade you need to use your old sim assuming it's the same size.

If not, do a sim swap Guide: Sim Swap: a mini guide 2017 update 

If it's a new contract, call customer service to activate the new sim card Guide: How to find help & contact O2 

[Senpai]

I'm not entirely sure that'd be the best move for me. My old sim isn't a 5G sim, my new sim is.

[MI5]

@Senpai 

Then do the sim swap as in the link I gave you.

[Bambino]

@Senpai If the new sim is a 5G sim, then do a swap as per the guide. You can also call into an O2 store, if you have one nearby, and they'll do it for you.