Sideline is a mobile app that provides users with a second phone number on their existing device. It allows users to separate professional and personal communications without needing two phones. The app operates over the mobile network, ensuring reliable voice quality without requiring Wi-Fi. Users can manage calls, texts, and voicemails just as they would with their primary number, making it a seamless addition to any smartphone.

Sideline is a subscription-based service that offers a free trial for new users. The typical cost is around $9.99 per month, though this may vary due to promotions or regional differences. There is no permanent free version, but the free trial allows users to explore the app’s features before subscribing. The subscription includes unlimited calling, texting, and additional features such as voicemail and number porting.

Sideline prioritizes privacy and security by implementing encryption to protect messages and calls, ensuring communications remain private. The app does not sell user data to third parties, providing users with confidence that their personal information is handled responsibly. It also offers options to block unwanted calls and manage spam effectively.

Sideline primarily supports domestic calls and texts within the United States and Canada. International calling and texting are not part of the standard service. Users needing international features may need to use additional apps or services designed specifically for those functions, as Sideline is optimized for local, domestic use.

Sideline offers several features beneficial for business users, including voicemail transcription, auto-reply, and team number capabilities. Users can set up a professional voicemail greeting and efficiently manage incoming calls. The auto-reply feature sends automatic responses to missed calls or texts, supporting prompt communication. These features make Sideline a valuable tool for professionals managing multiple communication channels.