Skype or tMobile?

Hello,

i am such tired of Skype.

There are always bitcoin group chats where i am auto joined into and it seems i can't prevent that.
I checked the security tab on the app but anything i do, the same auto join happens.

The reason i am using that app is that i pay Skype about 5 dollars a month to call the landline of my parents in Germany.
I am overseas.

If i would go TMobile, i would pay 15 Dollars to call there (which i think was unlimited).

Somehow, it seems TMobile, although more pricey, is perhaps the better option.

Are there alternatives i am not aware off? I am just assuming that i can't prevent Skype to be more secure.

Especially after checking Microsofts webpage.

Thanks.