Last year, Verizon quietly launched Visible, its all-digital phone service. Initially, it required an invitation and was only compatible with iPhones, but it has since opened to the public and started adding Android devices into the mix.

Earlier this year, Visible announced its first smartphone, Visible R2 by ZTE. And with its newest program, Swap, it's offering the R2for free to customers with Android phones that don't work on Visible's network.

The Swap program has a few caveats. First, you can only trade in incompatible Android phones. You'll also need to make sure your phone is paid off and can at least turn on.

For the most part, Swap is a solid option for people who either want to try Visible and do not have a compatible phone or those who currently own an entry-level phone. If you have an old Android phone lying around and your current phone is not compatible with Visible, it's an easy way to see if the service is a good fit. And if your budget phone is a few years old or has a cracked screen, Swap will basically give you a free smartphone for trying its service.

Since the Visible R2 by ZTE has a Qualcomm Snapdragon 425 processor, 2GB of RAM, and just 16GB of storage, Swap is not a good choice for customers with carrier-locked flagships like the Samsung Galaxy S10e. You'd be better off either buying the R2 outright for $100 or selling your current phone and buying a similar model directly from Visible.

It's also worth mentioning that while Visible may be a solid carrier, it's not a perfect fit for everyone. It's a subscription-based carrier, so you pay for the month up front. It also caps data speeds at 5Mbps up and down. And while the speed cap is fine, many users who just use their phones for surfing the web or scrolling through social media, 5Mbps may not be fast enough if you're a hardcore smartphone gamer or use your phone for data-intensive tasks.

Swap is available now on the Visible website and app. Simply enter information about your phone to see if you qualify and, if so, Visible will send out a starter kit with the R2 and SIM card. Once you're activated, you'll just need to send your phone back to the company within 14 days.

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