Then you're in luck! You can get 10 coins through downloading the Lezhin-plus app. I'll link instructions. If you're invested in RS like me then only being able to purchase 3 chapters for the time being shouldn't be a problem since it's the only new chapter available right now.
http://aminoapps.com/page/anime/4174825/getting-10-free-coins-on-lezhin
@Ms.Virgo a bunch of apps ask for that kind of permission. Access to accounts = so you can log in with facebook or google+, phone calls and contacts = so you can get notifications. Modify/delete content saved to your sd card = so if the app updates they can store memory into the sd card. All of these are basic things that a bunch of apps already do but they can't do it unless you give them all those extreme permissions. It's more an android thing than a suspicious app.
I'm actually really hung up on this manga, it just seems so interesting... Please Mr. Senpai return with your salty caramel kisses! Neo will die without the-
Oh, wait...