Second phone number at your fingertips. Sideline is the call and text app made for your smartphone letting you divide your communications easily and without confusion. Its time your phone service does more for you. Get text plus a second line to make calls and message without limits when you download today. Cellular features without the high costs Sideline is more than just a second line. Its a flexible, personal communication app that gives you a different phone number to call, text, and manage your contacts. Our text app is used by tens of thousands of users as their calling app of choice to help them transform how they keep in touch. Use Sideline as your dedicated second phone line, with custom caller ID and robust communications tools that give you a new way to stay connected. Unlike other texting apps, Sideline gives you a second phone line without the hassle and extra costs. Use your existing carrier and get a new phone number in no time. Start communicating with another phone line designed to organize your conversations and make life easy. Control your new number across different devices, text your friends, and even set reminders for calls you may have missed. Set up a voicemail and view caller ID Sideline lets you do it all. The calling and texting app designed for you. Download Sideline today to set up a second cell phone number with intuitive tools that help you stay connected and organized. Sideline is a complete communication app, not just a second phone line! Download Sideline today and set up a nd phone number that keeps you connected wherever you are.