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 v12.0+ and Android v4.4.4+
Supported mobile devices:
iPhone (5S, 6, 6+, 6S, 6S+, SE, 7, 7+, 8, 8+, X) running iOS 12.0+
Android: 4.4+, armv7 or x86 CPU
iPad (Air, Air2,Mini 2, Pro, iPad 2017 etc...) running iOS 12.0+
iPod Touch (6th & 7th Gen) running iOS 12.0+