On Android
Install the APK from this page. Until a store listing is published, you can also add the web phone to your home screen from Chrome after signing in at /phone.
Sound-Seed Mobile
Android calling for your numbers
Sign in with your Sound-Seed account to place and receive calls on your virtual numbers. Same SIP credentials as the web phone.
How calls work
The app registers your SIP username at sip.sound-seed.com over a secure WebSocket. Incoming and outgoing audio uses your microphone. Assign a number in the admin panel and set handling to SIP so it rings this app.