funny you should mention iphone. iphone is one of the more secure phone and Samsung is right alongside it.

Samsung or Apple? It All Boils Down to Security. For corporations, Samsung Knox has trumped all by introducing advanced device management features. "Secure Folder" will conceal whatever you hold on a personal note. Apple cares so much about the privacy of its clients, with features like end-to-end encryption and App Tracking Transparency. Ease of use regarding their devices and a very polished experience. Both sets of brands equally provide good security against theft and unauthorized access. But, of course, the wise decision is to choose on the basis of your particular needs and priorities: advanced business tools or a clean, intuitive approach centered around security.
https://www.airdroid.com/mdm/samsung-knox-vs-apple-security/

Are Telco's phone lock free?