Phone Doctor: Speaker & Mic
Diagnose iPhone speaker & mic issues, eject water with sound
What it does
Diagnose and clean your iPhone's speakers and microphones in seconds. Muffled audio after a splash? Calls sound weird and you can't tell if it's the phone or the other end? Phone Doctor tests each speaker (earpiece, bottom, stereo) and each mic (top, bottom, back) individually, so you know exactly which one is off. It also plays a tuned low-frequency tone that vibrates water out of the speaker grilles — the same principle Apple Watch uses for its water lock. Free on the App Store
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Hey HN, Henry here from Cactus. We open-sourced Needle, a 26M parameter function-calling (tool use) model. It runs at 6000 tok/s prefill and 1200 tok/s decode on consumer devices. We were always frustrated by the little effort made towards building agentic models that run on budget phones, so we conducted investigations that led to an observation: agentic experiences are built upon tool calling, and massive models are overkill for it. Tool calling is fundamentally retrieval-and-assembly (match query to tool name, extract argument values, emit JSON), not reasoning. Cross-attention…
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