I am currently evaluating the instant paypal free product. It's very nice and a snap to get set up. I am required to optimize every website feature for use on mobile devices and it seems that the paypal payment screen is not mobile-optimized.
I took a look at the documentation
and it appears that the payment page should be "smart" enough to determine when its viewed from a mobile device and adjust its layout accordingly.
For now only merchants integrated with 'Buy Now' buttons or third party shopping carts (using “Cart Upload”) will benefit from Mobile PayPal Payments Standard...
Is there any remedy that you may aware of? Are there any params that may influence what paypal returns in this regard?