Using eCoins can be great if you are a Non-Premium Member.
To get eCoins, you can do many things. One common way to get eCoins for FREE is to click on your IDfone and then click on "Earn eCoins". Keep watching ads to get eCoins. However, this is not very effective since Fantage has just started doing this, so there are not that many ads.
You can also buy a Game Card and redeem it on Fantage. Go to the home page and click on either Membership or eCoins(they are really the same page, if not, just click on eCoins). Click on the button that matches both how much you want and how much the card can pay for. Log in, and then click on the Game Card option. Then type down exactly what it says on the back of your Game Card. Click Submit and you are all done!