WISePhone (com.wisekey.wisephonefree) on Google Play
WISePhone+ properly secures mobile phone communications, so conversations are not vulnerable to monitoring equipment. It is a secure mobile soft phone that encrypts voice communications between devices.* WISePhone+ FREE can only be used by customers of the WISePhone service. You must have a WISePhone username and password to use the WISePhone service. Your company administrator will provide you with such credentials. *NO support nor warrantee is provided for this free application.NB: WISePhonePlus FREE requires that you have accounts on the WISePhoneGo hosted service from WISeKey. 30 day trial accounts may be requested from within the application.*IMPORTANT: VOIP OVER 3G NOTICE*Some mobile network operators may prohibit or restrict the use of VoIP functionality over their network and may also impose additional fees, or other charges in connection with VoIP. You agree to learn and abide by your cellular carrier's network restrictions. WISeKey SA will not be held liable for any charges, fees or liability imposed by your carrier for use of VoIP over 3G.★ Background Support★ Multiple Account Support★ Call display indicator★ Speakerphone, Mute and Hold★ Call history – list of received, missed and dialled calls★ Contact List - leveraging the Android Contacts★ Multiple Call Support✩ Swap between two active calls✩ Merge and Split calls (three-way conferencing support)✩ Call transfer (attended and unattended)★ Dial Plan Support★ Audio codecs include G.722 (HD), iLBC, GSM, Speex, AMR, PCM, PCMA★ Support for DTMF: the ability to enter numbers to use an auto attendantAdvanced Features★ Network Transversal✩ Application Managed, Server Managed or User Specified✩ Global IP Support✩ STUN★ Media Efficiency and Quality✩ Noise / Echo Reduction★ Security and Encryption✩ TLS and SRTP