Luno takes the security of your cryptocurrency stored in your wallet very seriously and has its security procedure already inbuilt into its system.
But still, they ask you to ensure you have two-factor authentication (2FA ) enabled & choose strong passwords as an extra sheet of protection from your end.
And in case your device has been stolen or compromised, & to avoid the misuse of your Luno wallet, they suggest to self lock your account by Reporting suspicious activity.