Not only are smartphones capable of taking fantastic pictures, but they can scan and save old photos too.
All you need is a good photo scanner app.
Google PhotoScan
Free.

Does one thing, but does it well.
Stores your scans in Google Photos.
Simple and easy to use for quality photos.

Photomyne
Fast scanning process is effective at eliminating glare.
Deep link into Google services; offputting for people who value their privacy.
Just a scanner; no meaningful in-app editing tools.

Microsoft
If you like fast and easy, Google PhotoScan will suit your photo digitizing needs.
The app prompts you to position a photo within the frame before pressing the shutter button.
PhotoScan takes the five snapshots and stitches them together, thereby correcting perspective and eliminating glare.
When ready, one press of a button batch-saves all the scanned photos to your equipment.
Download For:
Photomyne
Clean app that supports several photos in one scan.
Great tools for saving your scans.
Scans and digitizes multiple photos at the same time.
Accurate image cropping and auto-rotation.
Quality of the scanned images isn’t as solid as with other apps.
Photomyne does the same, making quick work of scanning and identifying separate images in each shot.
Theres also the option to include names, dates, locations, and descriptions on photos.
Google Drive, Dropbox, Box, etc.)
all digitized photos for safekeeping.
Microsoft Lens
App has value beyond just photo scanning.
Free and tied to Microsoft services.
Works fast, with a few basic edit tools.
Maximum scanning resolution for sharper images.
App not optimized for photo scanning.
App’s potential shines brightest when part of a full Microsoft program stack.
MS Lens is simple and straightforward; theres minimal configs to adjust and only manual rotating/cropping to perform.