How do I find my old phone IMEI number ? dont have the phone dont have the box?

[ianh3]

Decided to sell my old Iphone11 to Music Magpie - it has got lost and to make a clain they need the IMEI number - 

[MI5 · Accepted solution]

@ianh3 

Your only hope is if it is under device details in your MyO2 https://mymobile.o2.co.uk/

[Onetwo]

Generally networks know the IMEI when last used with the SIM, if you can the network to report the device lost, they might be willing to share the IMEI from the phone which last used the number, although you probably used the SIM on another phone by now which may be an issue.