iPhone Duo Has No Inner Earpiece: Why Calls Switch to Speaker When Unfolded

Three observations from the supplied review transcript

• No inner-screen earpiece: the reviewer explicitly identifies the missing receiver structure on the inside.
• Opening defaults to speakerphone: the described change happens when the Duo is opened.
• Close it for the earpiece: the reviewer demonstrates the folded form as the way to use that private listening mode.

Looking up a booking or reading a message

Imagine taking a private call, then opening the Duo to check an order number or document. Based on the review, that gesture can also change how the other person’s voice is played. In an office, train carriage or café, nearby people may hear the conversation.

Using the big screen for notes

The inner display can be useful while talking, but plan the audio first. A connected headset is the option to check if you want to keep listening privately while using the expanded screen. Confirm the route before the caller shares anything sensitive.

Making a hands-free call at home

When you already want speakerphone, the reported behavior may suit your routine. A compatible stand case can make a desk setup more convenient. A stand changes how you position the phone; it does not add an inner earpiece or control iOS call routing.

1. Stay folded for a normal ear-held conversation

This is the option directly described in the review. If you do not need the inner display, keep the phone closed and use its earpiece. If you have already opened it, close it and check that the call has returned to the listening mode you want.

2. Select your headset before opening the phone

Connect your AirPods or another compatible calling headset. In the call controls, tap Audio and select the headset if it is available. Check that you hear the caller through it before unfolding. Apple documents the Audio control for choosing a call destination, but the supplied Duo review does not test whether every headset retains its route through an unfold transition.

3. Check Call Audio Routing if speakerphone also starts while folded

Apple’s general iPhone guide places this setting at Settings > Accessibility > Touch > Call Audio Routing. Review the selected destination if your calls unexpectedly start on speaker even without opening the Duo.

This is a separate diagnostic check. Changing a routing preference cannot create the inner earpiece that the reviewer says is absent, and Apple’s general guide does not promise an override for the Duo’s unfolded behavior.

Audio routing and physical hardware are different

Software could potentially change routing choices or add a prompt. That is a possibility, not an announced fix. It would not add a physical receiver to the inner-screen side. There is no basis in the supplied segment to promise a future iOS update that enables conventional inner-screen earpiece calls.

Consider Duo if your calls already use a headset

If you routinely use headphones and want a larger screen for documents, test that exact combination before buying. The key check is whether your preferred headset and calling app keep the audio where you expect when you unfold.

Give conventional phone handling more weight if you often call without headphones

If your routine involves holding a phone to your ear and glancing at information mid-call, decide whether switching between folded and unfolded use would interrupt you. Compare that routine with an iPhone 18 Pro or Pro Max in person rather than choosing from display size alone.

Does opening iPhone Duo automatically answer an incoming call?

The supplied review segment does not establish that. It describes call-audio behavior when the phone is opened; do not assume that unfolding also answers a ringing call.

Will folding iPhone Duo end the call?

The reviewer says closing the phone is necessary for earpiece use. The segment does not establish a flip-to-hang-up feature.

Does the same thing happen in WhatsApp, WeChat or FaceTime?

The transcript does not provide an app-by-app test. Check your preferred app, audio destination and software version before relying on identical behavior.

Can I keep it half-open and still use the earpiece?

The review does not specify the hinge angle that triggers the change. Its advice is to close the phone for earpiece use. There is no verified angle-based workaround in the supplied material.

Will tapping Mute stop other people hearing the caller?

Mute controls your microphone. Use the audio destination control or close the Duo and confirm earpiece output to address the caller’s voice playing aloud.