You should be able to access your Talkatone account next time you sign into your account on an iPhone or Android device.
Talkatone supports iOS v10.0+ and Android v4.2+
Supported mobile devices:
iPhone (5, 5C, 5S, 6, 6+, 6S, 6S+, SE, 7, 7+, 8, 8+, X) running iOS 10.0+
Android: 4.2+, armv7 or x86 CPU
iPad (4th Gen; Air, Air2, Pro, iPad 2017) running iOS 10.0+
iPod Touch (6th Gen) running iOS 10.0+