I don't want to save my contacts, is there an alternative?

Yes, there is! You could simply use the flexible dial-in number, "toolani flex" for your calls.
One advantage is, that you don't have to save every single contact before making your call. Just call the toolani flex number and enter the international number manually afterwards. 

If you use the toolani app you can skip the step of saving your contacts, too. The app automatically connects you with the correct dial-in number.

More information about the toolani app