The feature to be rolled out to AT&T and Verizon customers soon.
The new feature is a part of the iOS 8.3 update, which includes several bug fixes and includes improvement to its Control Centre, Safari tabs, Wi-Fi along with introduction of multicultural ‘Emojis’.
Sprint announced that the feature will be provided following a software update, which is expected to roll out over next week.
Users will also have to download a new carrier settings profile that will pop up to enable high-quality Wi-Fi calls.
According to reports, Wi-Fi calling routes do not need connections to mobile cell towers, as calls routes through users Wi-Fi signals.
It will not use any talk time from carrier plan and is likely to work on more places where Wi-Fi signals are available, and is reportedly a good option for travelers.
Sprint product development SVP David Owens said: "Wi-Fi calling is like a major expansion of our network, allowing Sprint customers to get coverage anywhere they have Wi-Fi connectivity.
"Traditional wireless technology has some limitations in places like basements and high-rise office buildings. Wi-Fi expands our customer’s connectivity in a big way.
"The addition of Wi-Fi Calling for iPhone customers is just one more example of how Sprint is getting better every day."
Sprint also announced that the service will be available to iPhone 6, iPhone 6 Plus, iPhone 5c and iPhone 5s users.