The app is relatively new, and in my experience, it was a bit buggy.
However, I think the app has a lot of potential and is definitely worth checking out.
There's also a few ways to make the voicemail separate from your real number.
As a bonus, you can even port phone numbers over to Sideline, in case you don't want to let one go from another service.
The best part is that it can be used on more than just your Android or i OS smartphone; there's apps for Mac, Windows, Amazon Fire, i Pad, and Apple Watch.
The app grants you a 7-day free trial, and prices start at around .95/month.
If you decide to delete the number, you'll have to start over with a new one and new plan.
Unlike Hushed above, Burner numbers will use minutes from your normal carrier plan, but Burner does also have a separate voicemail inbox.You can select a US or Canadian phone number, granting you 5,000 calling minutes per month and unlimited messaging—that don't count against your cellular plan—with low international call and texting rates.There's also call forwarding, group calls and messaging, and voicemail-to-email notifications.The business plans, starting at .95/month, add simultaneous call forwarding, multiple lines, toll-free numbers, and other features. To get unlimited calling to your Text Me Up number, it's an affordable .99/month per line.Also, the first number you create is free, but you'll have to pay for additional numbers.