Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Ring4 - Manage business phone line as easily as you manage emails, in the cloud. Ring4 provide you with a business line and video conferencing solution.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Burner - Disposable phone numbers -- now with MMS photo support
Plivo - Plivo simplifies your customer engagement.
quackr - Protect your privacy & identity with quackr. Use our free temporary phone numbers to receive SMS online now.