❓ Problem with payment for Realm gold

So I bought myself 10$ to my phone so I could buy realm gold. The problem is that whenever I want to pay I can't and is says "Phone is invalid" or something like "It look like this Mobile Carrier is not supported. Please try another payment method..." But the problem is I don't have a paypal or anything other. So any other way for me to pay with my mobile phone? PS: I live in Croatia.

Your Mobile Carrier is not support. Get a Paysafecard for example, get a Paypal Account or buy Steam Gift Cards.

You might wanna try bitcoin if possible.