Update from Sprint Adds Wi-Fi Calling to Galaxy S4
Sprint today said a small software update being pushed to the tri-band Sprint Spark-compatible variant of the Galaxy S4 adds Wi-Fi calling. Wi-Fi calling is a free service and includes voice calls and messaging when connected to Wi-Fi networks. The Spark GS4 is the fourth handset to earn its Wi-Fi calling wings from Sprint. Sprint says it will add Wi-Fi calling to other devices in the coming months.