Discussion Ask HN: International Calling Say if I wanted to make an international phone calling app [1], where would one begin?Who do I contact (ATT, VZW)?How big are the margins for companies in the phone/sms space, like Rebtel? I'm looking for an API like Twilio, but their rates are ridiculous. 2 points localuser 13 years ago 0 comments
Who do I contact (ATT, VZW)?
How big are the margins for companies in the phone/sms space, like Rebtel? I'm looking for an API like Twilio, but their rates are ridiculous.