Freephonenum - Freephonenum is a website that receives online SMS, use temporary and disposable numbers from USA and Canada to get verifications code from all around the world for development.

Voxbone - Fully compliant, enterprise-ready voice and SMS on demand. Build local presence on a global scale with elastic SIP trunks and phone numbers. Try for free.

Hushed App - Hushed App will allow you to receive a Secondary Phone Number for Private, Long-Distance...

Twilio - Brings voice and messaging to your web and mobile applications.

SMS-man.com - SMS-man offers a virtual numbers to receive SMS and create multiple accounts on WhatsApp, Telegram, Instagram, Twitter, Amazon and others. The SMS-man service provides numbers of such countries as China, US, India, Russia, UK, Germany, Ukraine etc.

Bandwidth - Bandwidth offers SIP trunking, Emergency communications, and Voice & Messaging APIs.