Sim won’t work in my new phone

[Sim8]

Got a new iPhone from o2 took the sim out my old iPhone put it into my new iPhone and it won’t work any help with this?

[MI5]

@Sim8 

Some iPhnes have been delivered with temporary bars on them.

You'll need to call customer service.
Numbers here Guide: Coronavirus Community Help and Support 
When it comes to the reason you are calling stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
Say "Upgrade", "Lost/Stolen" or "Fraud" if you have to, to get put through to someone.
8.00am is the best time to call if you can.

[Insider331]

I would reccomend using the new sim card you would have received when getting the phone. You can complete a sim swap, if you did not receive a sim card you can contact customer service and ask for a replacement 5g sim and then complete a sim swap.

[MI5]

---

@Insider331 wrote:

I would reccomend using the new sim card you would have received when getting the phone. You can complete a sim swap, if you did not receive a sim card you can contact customer service and ask for a replacement 5g sim and then complete a sim swap.

---

Good advice, but if the old sim isn't working, the bar needs lifting first.