Phone Donations

First off, hello. I'd like to purchase premium status using a phone and I'm uncertain whether it will work from a pre-paid card or only off a subscription plan. Also, living in Easter Europe, I gotta ask if that's even possible at all (let's just imagine that I'm on Vodafone). If so, is it true that even the smallest amount of coins bought (I noticed I can even buy just one) is enough to grant the ability to skip queues? It used to be like that before the Molten "fiasco" a few years back, I'm just curious if it's the same nowadays after reading some other posts where it says the minimum is 10 euros (or was it dollars?) ...

Thank you for your time!