Sim card

[Simey]

Got new device all set up but sometimes fires up insert sim no service then ask which sim to use

[jonsie]

Can you look in settings to see if you can set to always use the samke sim.

Other than that it may be a faulty sim and you need to call O2

Everything is taking longer due to the lockdown. Call centres and social distancing means limited staff to handle all the queries. Patience needed I'm afraid.
https://community.o2.co.uk/t5/Other-Products-and-Services/Coronavirus-Covid-19-Community-Help-and-Su...
Other numbers to try
0800 977 7337
0800 587 4005
0800 0901808