The following review was conducted in August 2016, and information on subsequent software updates and new version releases may not be reflected within. This review predates OnSIP’s mobile app for iOS and Android, free to OnSIP users, so is not affected by bias.
Grandstream Wave is a free softphone app that aims to bolster remote working and replace cell phone services. Wave allows you to make and receive calls on your business or residential SIP accounts on any Android or iOS device. The app can operate from anywhere in the world with an Internet connection. Wave seeks to rid your phone of costly cell phone bills, relying on VoIP instead of aging cell phone networks.