The TeleSign Voice Ruby Sample Code by TeleSign demonstrates developers how to integrate voice into mobile applications. Three examples include sending voice call, verification code, and call in French language.
When Zappos released its API, there was a strange restriction: no mobile applications. While sometimes lawyers write terms that aren't formally enforced, Zappos made it clear on its API mailing list that it was serious. Soon, the restriction will be removed and mobile applications will be allowed without written approval.