Start with your employer’s policy and use approved systems for patient...

https://rylansexpertjournals.cavandoragh.org/can-i-use-my-personal-phone-for-patient-messages-at-work

Start with your employer’s policy and use approved systems for patient messages. Hide lock-screen previews, set clear on-call notification rules, and check which account you’re using before sharing anything. Keep personal chats on your own phone.