If my phone gets stolen with the pin known. What are the steps I could take to safeguard my accounts ?

Hi,

Recently had some discussions with a friend about the privacy options in Android/Apple phones. lets say if a thief somehow seen me enter my pin to my phone and then steal it. Are there any options in Android and iOS to safeguard my accounts stored in my device ? since the thief has access to 2FA sim and knows the password too. Appreciate your input on this.

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