Mobile Phone Donation Acceptance 
I am with a Credit Card payment processing company called Optimal Payments, and I think we have a couple great solutions to the issues raise don this page. Being a full service international payment processor (gateway, merchant account, reporting, chargeback management) and eliminating multiple vendors, we typically can save our merchants 10-30% in processing fees. Our website is www.optimalpayments.com.
There is also a company that we partner with called Mobio Identity Systems that may be of interest to you, as it would enable you to collect donations right on your website with the quick scan of a 2D barcode (eliminating the time consuming task of filling out forms on the website). Here is a brief overview of the technology they offer:
Mobio uses the iPhone, Android (and soon Blackberry)platforms and leading edge 2D ‘barcode’ technology that allows you to instantly receive payments from anywhere. With a wave of an iPhone over a special 2D Mobio barcode, customers can buy your products and services from any media you choose including print advertising, billboards, TV and the Internet. There is no hardware or infrastructure required. Account set-up is simple.
It would simply be my goal to provide the Wikimedia Foundation with a better overall payment solution than you currently have. Please let me know what you think, and if you are interested in hearing what we are able to do for you we can schedule a time that would be convenient to discuss this opportunity. Brent.email@example.com