What are some alternatives?
Bitrix24 - Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
Twilio - Brings voice and messaging to your web and mobile applications.
PhoneBurner - PhoneBurner is a cloud-based power dialer to boost sales productivity
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Nextiva - Business VoIP, cloud phone systems trusted by more than 150,000 companies. Powered by the leading cloud PBX VoIP platform, Nextiva is rated the best business VoIP service provider.
Bandwidth - Track your Wi-Fi hotspot usage. Zero configuration required. It just works.