The phone hardware is compatible with Public Mobile (Telus) radio frequencies, although it doesn't support all 4G/LTE bands so it won't get the fastest possible Data speeds or great Data performance in fringe service areas.
The phone software might or might not be compatible. Check if it allows you to add new APN settings or to edit existing APN settings. If it's a version of Android which only accepts carrier-locked carrier-pushed APNs then it basically won't connect to Data on Public Mobile (without rooting, hacking, or firmware modding the OS). Public Mobile does not push an APN profile so if you have no option to enter APN manually then you have no access to Data (or msg attachments) on the network.
If you do not have enough prepaid funds available in Self-Serve account to renew your Plan then it becomes Suspended (with no service). It will remain Suspended until it's Terminated 90 days after last payment was made. If it's Terminated then you lose all remaining account balance, Rewards, phone number, and SIM card (permanently deactivated). There are never any fees or penalties for suspending or (re)activating service so you can choose to simply ignore your phone cost for a while without charge, just don't forget to pay for service (with the cheapest Plan available, if you're not even going to use it) before it's finally terminated. Everything can be done through your Self-Serve login so it's easy enough to manage if your on extended travel. Remember to Suspend your AutoPay, of course, or you'll still end up paying for service anyways.
