Donuter
very good customer support
very good customer support

Vonophone is an international calling service for cheap phone calls to landlines and mobile numbers in 200+ countries. You call over the internet; the person you dial receives a normal phone call. They do not need an app, an account, or internet. There is no hidden fees. You pay only for the minutes you use.
Vonophone - Cheap International Calls (vonophone.com) has 1 customer review on Five Star Index, with an average rating of 5.0 out of 5.
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Donuter
very good customer support