About Duo Signal

What we check

We use Apple's online pickup response for an exact US product configuration and a search ZIP. Our directory covers 269 US Apple Stores, with 8 iPhone Duo color and storage combinations. Every store is included in the national background monitoring schedule. The live page separately shows scheduled coverage, stores with observations, and fresh results.

The national monitor runs without visitors or saved alerts. Each source request checks all eight configurations and updates every confirmed nearby store. Saved alerts receive scheduling priority while older national observations continue to be checked. The target interval is 30 seconds; queues, connectivity and upstream limits can extend that interval.

How to read a result

Available for pickup

A successful, recent Apple check reported pickup availability for that configuration.

Out of stock

A successful, recent check reported that configuration unavailable for pickup at that store.

Not verified

We do not have a conclusive successful observation for this selection.

Check expired

The last observation is more than two minutes old. It is not a current stock claim.

Cached results keep the time of the original observation. A failed request does not become an out-of-stock result. We do not infer shelf inventory, shipping dates or future deliveries from pickup availability.

What happens after a match

Fresh, confirmed availability for a saved alert enters the notification queue. Each restock event is deduplicated, and the sender checks that the alert and channel are still enabled before delivery. Email uses Resend; browser notifications use standard Web Push. You can test each channel from your account.

Duo Signal does not buy or reserve devices. Complete purchases at Apple and wait for Apple's pickup confirmation. We do not need your Apple ID password or payment information.

Your alerts, your controls

Live stock and restock history are free. Monthly alert subscriptions include 5 alerts for US$5 or 10 alerts for US$10, or 30 alerts for US$20. Starter and Plus include five stores per alert; Pro includes ten. There are no referral payouts. You can pause alerts, remove devices, export your data or close your account.

Read the privacy policy, view service status, or send service feedback through the Community page.

Sources and independence

Product options come from Apple's iPhone Duo purchase page. Store details come from Apple's retail directory, reviewed November 1, 2026. The restock history contains only this service's observed events.

Nearby-store distances use coordinates from Apple’s store pages and ZIP centers from GeoNames (CC BY 4.0), retrieved November 3, 2026. ZIP data is reduced to coordinates and grouped for local lookup. Distances are approximate straight-line miles from the ZIP center, not driving distances.

Duo Signal is not affiliated with Apple. Apple and iPhone are trademarks of Apple Inc. Our guides link to original sources, and we update them when the steps or service behavior change.