SmartLine is a productivity app designed for iPhone users seeking a separate phone number for business purposes. This app allows users to answer business calls professionally while keeping their personal number private. Key features include professional-quality calls that utilize cellular connections, a spam call filter that directs unwanted calls to voicemail, and the ability to record custom voicemail greetings. Users can also transcribe voicemails to text, which streamlines communication and saves time.

Additionally, SmartLine enables users to set specific business hours, ensuring that calls outside these hours are sent directly to voicemail. The app organizes conversation histories, including calls, texts, pictures, and voicemails, by contact for easy access. Notifications for missed calls and messages help users stay on top of their communications, making SmartLine an efficient tool for managing professional interactions.