VOIPDiscount payment process

[ferossan]

I have my sister living in Moose Jaw (Canada) and I'm trying to help her signing in (already done) and paying for call credits (no joy yet) in VoipDiscount.
The problem is that when she try to pay with her credit card, she is asked for her mobile phone number to send her a code for verification and security reasons. Here is when the strange thing comes up: given the mobile number, voipdiscount appears sending her the code (via SMS) but it never arrives, maybe wrong number? to test it, I call her mobile from my voipdiscount account and she got the call, so, the number is fine. Then, I send her an SMS (from my voipdiscount again) but it never arrived either. Ok, maybe her mobile is not able to get SMS's? she call her company and she was able to receive them. So, we end up with a mobile that can't receive SMS's only from voipdiscount (but is able to get calls from the same).
Sorry the extension of the explanation.
Now I'm wondering if you know what she could do. Do you think if I give her my mobile number (from Chile) to pass the payment process and get the verification code will work? (My mobile works fine receiving SMS's from voipdiscount). Do you think in any another idea that could solve this?
(We know there are other payment options in add of credit card, but are lot more expensive ones)
Thank you for your patience.

Fernando