I suggest to give a better description on this page https://www.warmane.com/account/donate because at the moment it says:
"Donations award coins and a Premium membership ... etc"
Which is not true. It does not awards Premium membership for who donate the minimum amount via Mobile
All donations should award premium membership, including mobile donations. If you are not granted a premium membership after donating via mobile, please message our support via ticket or email [email protected] and they will grant you one manually.