I'll be 100% honest, I don't know the ins and outs of mobile commerce, but here are the facts I do know:
* We don't test Power Store or eCart on mobile browsers. We do not offer support for them on the mobile platform.
* Mobile browsers do not have all of the same functionality as the Desktop Versions, there are limitations to what mobile browsers can do
* All of the gateways I have checked have different API's to use use for checkout with mobile devices.
Does this mean power store / eCart _cant_ work on a mobile browser? No, but we have not tested it and do not support it.