FIBERME SWING-Lite is a free mobile softphone available for both Android and iOS. It can be downloaded from the Google Play Store and Apple App Store.
Main features include:

• Make and receive calls

• Hold

• Mute

• Call transfer (blind and attended)

• Three-way audio conference

• Push notifications

• Sync with local phone contacts

• Support for all voice codecs

• Biometric login (Android only)