Ya you register and they send you a card.Then you Top up in shops where its available or online at 3v.ie I think.Its just like buying credit for your phone. Theres a small fee for voucher..I think the 1st top up is 5.00 and 2.50 for any after that bit thats the only charges you have.There is a limit on how long you can leave it without spending it but thats all on the website.Hope this is of some help to you.
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