Alternate phone numbers are great for privacy. You get control over who gets your number, freedom from robocalls, and more. We’ve put together a list of the best second phone number apps. Some are free, some aren’t, but they’re all available on iOS and Android.

Google Voice has a complicated existence. It’s been around for a while, but hasn’t had many significant updates over the years. Given Google’s history of building and then killing products, take what you will from that. But the best part about this app is that it’s completely free.

It’s easy to use and even has a web interface. One thing that makes Voice unique is that it can be set to ring multiple devices at once, so you never miss a call. You can make calls over the internet, as well as send text messages and listen to voicemails. Google Voice even has a spam filter for messages and voicemails, so you can sort them out.

Like most free second number apps, Voice will recycle your number if you don’t use it. However, we don’t see this as a drawback because you’ll be warned a few times before losing access. Plus, you only need to send an occasional text message to keep it active.