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If some one loss mobile phone actually the exchange account keep appear if login trough APP, I used Binance APP and account keep existing for long term and linked 2FA, email at the same mobile phone easily for some one withdrawing your fund if not set up biometric or using PIN code to withdraw fund at exchange account.
If you do lose your phone, there is still double security on the smartphone itself,
passwords or fingerprints will be a barrier door for those who find or steal the smartphone, so it will not be able to be opened by anyone.
Now smartphone security is more sophisticated and it is not easy to hack or bypass the screen security code,
even if it is forced to open, the data will be permanently deleted.
So in addition to exchange account security, smartphone security also needs to be considered,
always use screen lock security so that no one can access the smartphone when it is lost.