I use Duolingo in addition to Spanish classes and reading, but I'm considering dropping it. I pay for it. Their support told me that paying customers get the same value for money whether using a laptop or mobile phone. This is simply not true. Paying customers are still forced onto mobile phones, despite paying for the privilage of not being advertised at. I do not see the benefit. I am posting this review as it seems to be the only way of getting Duolingo to repair the problem.