In the next few weeks, Sprint(s s) customers with a Samsung Galaxy Mega or a Galaxy S4 Mini will get an over-the-air software update that will turn their devices into IP phones – at least when they’re connected to Wi-Fi networks.

In a blog post on Friday Sprint said it has begun introducing Wi-Fi calling, starting with the two Samsung phones and gradually rolling out the capability to other devices throughout 2014. Customers who activate Wi-Fi calling (through an app that will come with the update) will be able to send and receive calls and text messages over their home and business networks and hotspots. Unlike other over-the-top VoIP and messaging services, Wi-Fi calling won’t require customers to create a new account. The service remains attached to your regular phone number.

The service is free-of-charge, and if you happen to be a Sprint customer still on a metered minute or…