[tlack]

Does anyone know what service WhatsApp used for SMS delivery for phone number verification? I wish I could get text messages into all parts of the world like they do.

[stanleydrew]

At Bolt (https://bolt.co) we use Twilio for this, and I'm pretty sure WhatsApp does too along with other providers. With Twilio we also fall back to delivering access tokens with a phone call when the SMS fails.

(Full disclosure: I am a former Twilio employee.)

[username223]

Fuller disclosure: you're just another spammer.

[yonasb]

Authy (a two-factor auth service) uses a combination of Twilio and BulkSMS (they say that BulkSMS is particularly good for Latin America). Authy explains how they handle global SMS here: http://blog.leanstack.io/how-authy-built-a-fault-tolerant-tw...

[sjtgraham]

They used multiple providers.

[stickydink]

http://nexmo.com has pretty decent coverage

[andypants]

Not really, there wasn't even a category for France and several first world countries did not have any available phone numbers to buy.

[willvarfar]

I work for a company called mblox; we put all our effort into reach.

[twistedpair]

SNS by AWS does it too.