@becomethewaifu @dalias Mobile deposit is evil.
My bank used to (until ~5 years ago) allow me to scan a paper check and upload front/back side jpegs through the website.
There are exactly zero security features in a paper check that you can't trivially forge well enough to fool a phone camera. It makes no difference if the image is coming from a camera or a flatbed scanner or what. The numbers and amounts are what matters and they'll be reconciled with the sending bank when the check clears.
I'm very tempted to get a dedicated phone just to do mobile deposits of the few checks a year I have to cash, so I don't have to ever install the app (and so I don't have to trust my banking credentials to my phone rather than the isolated VM I normally use)