Keepgo
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Keepgo operates across Optus and Telstra's networks in Australia, offering eSIM data plans that don't expire. The service includes native VoIP application support, meaning you can use apps like WhatsApp, Viber, and Skype for voice calls without carrier restrictions.
This option works well for frequent travellers who want the flexibility of calling applications plus always-on data without plan expiration stress. Compared to monthly-renewal plans, Keepgo's lack of expiry dates suits people with unpredictable travel schedules.