Sideline, Line2, Hushed are some. They are like I believe 4.99 or 5.99 per month. So when you get the call in their number, it will come in app itself. Advantage: they are cheap. Drawbacks mayyyyy be not forward able, no merging, and if u decide to cancel the service due to inconvenience due to its drawbacks, then you might have to update the number in your resume. The number is gone.