I believe you went under the credit card option. Those options sound credit card related. The fact that it asks for the amount and the security code makes me think it's credit card. For voucher topup, just the voucher # is required. There should be an option for voucher topup. And, it should not matter if you are doing it from outside the UK.
Quote:
Originally Posted by skins07
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.
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Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile