Did you follow the instructions for the card's activation?

You must somehow link it to their website and your account.

No idea how that goes, I'm just repeating something a kangaroo forwarded me.

https://www.facebook.com/MiracleTele/posts/its-really-easy-to-use-miracle-tele-sim-card-and-the-only-thing-you-need-to-do-t/305017976951694/

Or step by step:

Connect your device to wifi – enter phone settings – go to mobile networks and add a new APN indicating miracletele.com in the APN field.

Activation – login to your account on miracletele.com click on activate Simcard in your member area and follow the instructions.

Get a number - https://miracletele.com/operator/

And pray to God you don't pick one of those numbers that'll cost you 15€ or more per month.

Ups there's also a fee for the activation of your phone number – 6€.

Yep, it suddenly doesn't look so cheap anymore, doesn't it?