Spirit MobileVoice is a SIP-based softphone for the iPhone and iPad that works in conjunction with Spirit Communication’s IP-based voice service. It is a standalone softphone, not a VoIP service, and requires a subscription with Spirit Communications to use. With Spirit MobileVoice, users can make and receive voice calls over Wi-Fi or 3G/4G connections using an easy-to-use and intuitive user interface.

The app allows users to access their existing contacts list, enabling them to easily make calls to their contacts. It also offers features such as conference calling, call transfer, call forwarding, and call history. Users can customize their experience with features like custom wallpaper, ringtones, and contact avatars.

Spirit MobileVoice supports multiple accounts, allowing users to manage multiple phone lines or extensions. It also provides advanced features such as noise reduction, echo cancellation, and voice activity detection for improved call quality. Additionally, it supports QoS (Quality of Service) for better call quality and provides call quality statistics.

Please note that some mobile network operators may restrict or prohibit the use of VoIP functionality over their networks and may impose additional fees. Users are advised to abide by their cellular carrier's network restrictions. Spirit Communications is not responsible for any charges or fees imposed by the carrier or any service quality issues experienced due to the mobile network provider.