What devices can I use the sync. app on? You can use the sync. app on most iOS and Android mobiles so long as they are iOS 11.4 and Android 6.0 versions and above. Related articles Who can download the sync. app? Who can sign-up for sync.? Do I need to re-link my sync.card to the app if I change my phone? Why do I need to verify my email address? What are the transfer fees?