First, you need to register. Open the app on your smartphone and fill in your:
Mobile number (Prefix + number without 0)
You'll receive an sms with a confirmation code.
Enter that confirmation code in the app.
After you registered, you can try our service with the €0,50 in free promotional call credit you received by clicking on "Try for free" first.
If you would like to go ahead and purchase some call credit, click on "Buy Call Credit" and select the amount which you would like to buy (€10, €25, €50 or €100). If you use iOS, it's better to purchase credit here: https://www.call-tiger.com/en/topup
You will be asked for your payment method and details. If you want to save your credit card credentials, you can tick the appropriate box. As soon as you have successfully completed the transaction, the credit will be added to your account and you can start calling right away.