Being a Luddite, I don't have a smart phone of any type. My cell phone needs are too simple. But, I do follow some developments in the field. For those who use Android, you should read Major weakness in Google's key storage breaks open Android's Full Disk Encryption
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Jon

OS 10.14.4, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365