VoIP.ms is a voice-over IP service that provides an alternative to traditional land lines and mobile phone plans. The service offers a web-based sms service however it is difficult to operate on a mobile device. VoIP.ms sms seeks to solve this issue by providing users with a mobile SMS experience on the VoIP.ms platform. If you already have a DID or multiple DIDs (phone numbers) with VoIP.ms you simply need to enable API in the VoIP.ms customer portal to take advantage of SMS on your iPhone. The app has the ability to sync with your existing contacts and also supports push notifications.