For the last two days I have no signal on my phone. I have been to a local Virgin store but they were unable to help me. At the moment I am unable to call you and an online Virgin chat is never available.
Also, tariff options are unavailable for me and they never were.
Today I inserted the SIM card into Sony Z1 Compact to find out that no signal can be found. I put back an original SIM card (Virgin Mobile also) into Z1 Compact and now two of the SIM cards are receiving no signal. Both cards ask for PIN code and the phones ask for a network provider. No network issues in the area were detected.
EDIT: I had to manually choose network on Z1 Compact. Both cards are working, only the network has to be selected manually.
FINAL EDIT: It works now on Lumia 820 after I maually selected network on Z1 Compact.