It would be handy to see if a different handset produces a different result for you, but that being said, it's probably best you don't purchase one to find this out..
Is there anyone you're able to ask who would be willing to assist you?
With your handset, you can also try this for me, to see if it will work on your handset;
-Manual network search and choose any other network except Virgin or EE e.g., O2,
Vodafone etc. (will tell you unable to connect or show no service)
-Switch handset to 2G only. This can usually be found by going to the "settings" option within the menu of your phone
-Then manually search again and choose Virgin
-Then set back to 4G
Kindest regards,
David_Bn