Prepaid UK SIM

[skins07]

Originally Posted by Bossman

Buy a topup voucher on ebay.uk and use that.

I just did that. I am in the US. I purchased a T-Mobile top-up voucher from a reliable UK eBay seller. He sent me the 16 digit code. The SIM card "Interactive" program appears on my Windows Mobile phone. There is an option in the program for Prepay topup. It asks for the amount, then the last 4 digits of the card number (which I assume is the 16 digit code). Then it asks for the card security code (which I assume is the SIM card PIN). When I try to enter this information, I get an message that says error sending message.

Is this because the SIM card has not yet registered on T-Mobile in the UK? The customer service rep at T-Mobile UK said that should not make a difference.