Talkatone tracks devices via Google Advertising ID (on Android) or IDFA (on iOS). If their heuristic detection flags your account for "abnormal MMS attempts" (e.g., 500 requests in 5 minutes via a proxy bypass attempt), they will not just ban your account. They will blacklist your hardware. You will never be able to create a new Talkatone account on that phone again, even with a factory reset.
Over the years, users on Reddit, XDA Forums, and Telegram channels have proposed various methods to bypass the premium requirement. Below is a realistic breakdown of these claims. talkatone premium message bypass