Unused phone - invalid SIM

[Fishy]

We bought Mum in Law a Doro phone. Although we said to use it, she hasn't since September. Subsequently the SIM is rendered invalid. Is it just a case of getting a new one?  (I thought I had registered it under my account but couldn't find it but may have done so using a different e.mail but can't access that account! )  Thanks for any help.

[MI5]

Hi @Fishy
Just order a new one from here https://www.o2.co.uk/shop/sim-cards/pay-as-you-go or pop into your local o2

[Bambino]

@Fishy Did you ever put any credit on the sim? If you did the credit should still be valid.

[Fishy]

Thanks for replies. Think we'll need to visit a shop to get a new one. We did put credit on but can't check as phone can only be used for emergency calls. Thanks again. 

[MI5]

Take the old sim with you and if there's any credit on it they should be able to either activate it or transfer the credit to a new one.

[jonsie]

If you have to get a new sim, be sure to ask for the Classic sim.