When a customer scans your QR or taps your link, they can join the line from their phone. They give a first name and mobile number, and they're in — with a spot number and an estimated wait.
Now they don't have to stand around. They can go grab a coffee or run an errand, and NowServing texts them when they're next. When you tap "Serve" at the front desk, the queue advances and the next person's text goes out.
Because customers manage their own spot, your public wait time stays accurate without anyone having to keep a counter perfectly up to date — the number is honest by itself.