you can have two p.a.y.g SIM cards and if you register them and create an account in your name with email address and password. You will be able to monitor them by logging into that account.
As "pay as you go" they are limited to the "rewards allowance" or the amount of credit that you place on each number.
You can order a SIM and view tariffs here: http://store.virginmedia.com/virgin-media-mobile/sim-only/pay-as-you-go-sim.html
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