Phone number for donations?

I'd like to start making small, regular donations to SPI, explicitly for
Debian. I use my bank's bill-pay function for this sort of thing.
Unfortunately, my bill-pay service requires a US phone number for the
recipient, and I'm not finding such a thing in the SPI web site.

The WHOIS database lists a non-US number, which I can't use for the purpose.

Is there a solution for folks who require a phone number to donate? For
various reasons, only one of which is laziness, writing out checks by hand
and mailing them isn't a good option for me, and I don't tend to allow things
to pull through a credit/debit card directly.

Thanks in advance for clues!

--
Mason Loring Bliss (( If I have not seen as far as others, it is because
mason(at)blisses(dot)org )) giants were standing on my shoulders. - Hal Abelson