Can the same trading account be used on multiple devices?

Yes, most brokers allow logging into the same trading account from multiple devices, like a phone, a desktop app, and a web browser, simultaneously, since this is a common and legitimate use case for checking positions on the go while trading from a desktop. That said, some brokers apply session limits or extra authentication for certain sensitive actions (like placing a large order or changing account settings) even when logged in from multiple devices, as an added security layer. You make it a habit to periodically review your active login sessions through the app’s security settings, specifically to check for any device or location you don’t recognise, since legitimate multi-device access and unauthorised access can look identical from the account’s perspective unless you actively check the session list.