Suparelay

Call landlines and mobiles in 200+ countries from your browser. The person you call needs no app. Prepaid, from about 2 cents a minute, price shown before you dial. Type the number, see the price for that exact number, press call, and their ordinary phone rings. Billing starts only when somebody answers; busy or unanswered calls cost nothing. Prepaid credit from $5, no subscription, and the credit never expires.