Open your phone's default Camera app (or any barcode/QR scanner app — "Google Lens" on Android, or the Camera app on iPhone) and simply point it at the printed barcode. These are standard Code128 barcodes, so any scanner app or handheld barcode scanner will read them — no special app needed. If scanning fails, make sure the barcode is printed clearly (not blurry) and well-lit.
Generate a printable batch of consecutive barcodes — e.g. starting number 1 with count 100 gives barcodes 1 through 100.