WhatsApp: Free Between Users, Can't Call Phones
WhatsApp's biggest limitation is also its most misunderstood: it cannot call regular phone numbers. WhatsApp only handles app-to-app communication. If the person you're calling doesn't have WhatsApp, you simply can't reach them.
For calling other WhatsApp users, it's excellent — free voice and video calls with end-to-end encryption. But that's a different product category entirely.
Viber Out: The Hidden Calling Feature
Viber has a paid feature called Viber Out that lets you call real phone numbers. It's not prominently advertised, and many Viber users don't even know it exists.
Rates vary dramatically: $0.01/min to the US but $0.20+/min to some African countries. The pricing transparency isn't great — you need to check each destination individually. Calls are billed per minute (rounded up), so a 61-second call costs you for 2 minutes.
TwinPhone: Purpose-Built for Real Phone Calls
Unlike WhatsApp and Viber, TwinPhone was designed from day one for one purpose: calling real phone numbers internationally at the lowest possible cost.
Rates from $0.02/min, billed per minute — and the exact per-minute rate is shown before every call connects, with no connection fees and no hidden charges. Works in any browser — no app to install. Every call encrypted with TLS + SRTP. Adaptive audio handles poor connections gracefully.
It won't replace your messaging app, and it's not trying to. It replaces the expensive part of your phone bill.
관련 자료
Pay as you go
Call 145+ countries, pay per minute
Free to sign up — no card needed to start. Top up $10 and pay only for the minutes you actually call. No subscription, no monthly fee.
No card to sign up · Top up $10 · Pay only when you call
