A touchscreen does not work underwater, and no amount of waterproofing changes that. Water is conductive, so it spreads across the glass as a second conductive layer and the sensor can no longer tell a finger from the sea. That single fact is why a waterproof pouch leaves you tapping at a screen that has stopped listening, and why a real housing gives you physical buttons instead.
Why the screen stops responding
A phone screen is capacitive. It holds a faint electrostatic field across the glass and watches for the change your fingertip makes when it comes close. It is looking for one small, local disturbance in that field.
Put it underwater and the disturbance stops being local. As one plain explanation of the mechanism puts it, water is a conductive medium, so when a capacitive screen is submerged the water creates an additional conductive layer over the screen, and the screen cannot distinguish between a finger touch and water contact (Reshine Display). The field changes everywhere at once. The phone either registers nothing or registers phantom touches all over the glass.
This is physics, not a flaw in your phone. An IP68 phone survives the water perfectly well. It simply cannot be operated in it. Waterproof and usable underwater are two different claims, and most pouches only make the first one.
What a housing does instead
A proper housing takes the controls off the glass and puts them under your fingers. Physical keys on the outside of the case talk to the phone over Bluetooth, which is a radio link rather than a touch, so depth and water make no difference to it. You press a button, the camera fires.
Everything else follows from that. You can shoot one-handed while the other hand steadies you against current. You can change mode without looking. You can wear gloves. And you never have the moment, familiar to anyone who has tried a pouch, where a fish goes past and you are prodding uselessly at a rectangle.
The checkable quality signal in this category
There is no single consumer standard for phone diving housings the way there is for diving watches, so the useful checks are these. They apply to any brand.
- A depth rating in metres, not a word. "Waterproof" is marketing. "20 m" is a claim with a number attached that a manufacturer has to stand behind.
- A way to test the seal yourself. This is the big one, and it separates real housings from pouches. A vacuum pump lets you pressure-test the case before every entry. If a housing has no method of verifying the seal, you are trusting a rubber gasket you cannot inspect with a phone you cannot replace cheaply.
- Physical controls, and how many. One button gets you a shutter. Five gets you shutter, zoom in, zoom out and mode switching, which is the difference between capturing something and composing it.
- A stated light transmission figure for the port. The optical window sits between your lens and the water. A figure such as 97 percent visible light transmission is measurable. A port described only as "optical glass" is not.
- Anti-fog treatment. Warm phone, cold water, sealed air. Condensation forms on the inside of the port and ruins the shot, and it is entirely predictable, so a housing that ignores it was not designed by anyone who has used one.
- Standard mounting threads. Quarter-inch threads mean you can add a light or a tray later. Proprietary mounts mean you cannot.
- A stated clamping range in millimetres. "Fits most phones" is not a fit statement. A range such as 50 to 80 mm is.
Pouch, phone alone, housing, or an action camera
| Waterproof pouch | IP68 phone alone | Diving housing | Action camera | |
|---|---|---|---|---|
| Survives the water | Shallow only | To the phone’s own rating | To the housing’s rating | Yes |
| Can you operate it | No, touch fails | No, touch fails | Yes, physical buttons | Yes |
| Camera quality | Your phone’s | Your phone’s | Your phone’s | The camera’s |
| Can you verify the seal | Rarely | Not applicable | Yes, with a vacuum pump | Not usually |
| Extra kit to buy | None | None | Housing only | A whole camera |
| Cost | Very low | Nothing | Moderate | High |
| Best for | Rain and a pool edge | Accidents, not photography | Snorkelling and recreational diving with the phone you own | Regular diving and rough handling |
Going in the water?
The 20 m underwater housing with five-button control ·
staying on land, the Master Portrait Grip Kit.
What we sell, and what it actually is
The Underwater Phone Case is built by TELESIN from ABS and polycarbonate around an aluminium alloy frame, and sealed to 20 metres, or 65 feet, to the maker’s IP68 rating. That covers snorkelling and most recreational diving.
Five keys drive the camera over Bluetooth: shutter, zoom in, zoom out and two shooting modes. The optical port passes up to 97 percent visible light and the interior is anti-fog treated. Two universal quarter-inch threads take lights, a tray or a diving grip. It fits straight-screen phones up to 7 inches with a clamping range of 50 to 80 mm, pairs with both iOS and Android, and comes in at 203 x 109 x 52 mm and 397 g.
In the box: the housing, a vacuum pump, a safety hand strap, a cleaning cloth, a USB charging cable and the manual.
A phone is not included, and neither are lights or a diving grip. This is a housing for a phone you already own.
The test to run before your phone ever goes in
Do this once, before the housing is anywhere near your phone, and repeat it after any knock or long period in storage.
Open the case and put a tissue inside. Seal it, attach the vacuum cover, and submerge the empty housing for at least 30 minutes. Take it out of the water but do not open it yet. Then open it and check the tissue. Dry means the seal is sound. Damp means stop and contact us before you use it.
It takes half an hour and it is the difference between a housing you trust and a housing you hope about.
Setting your phone up
Pair the housing over Bluetooth as TELESIN_SDC before you seal the phone in. If nothing connects within two minutes it powers down by itself.
iPhone, once only. Settings, then Accessibility, then Zoom. Set Zoom Region to Full Screen and turn Zoom on. This unlocks full button compatibility. The screen magnifies once Zoom is on, and a triple-tap returns it to normal.
Samsung. These models will not wake the camera from a dark screen, so turn off auto-lock or set the screen timeout to maximum, and open the camera app manually before sealing the phone in. Photo, Video and More are the supported modes, and if you switch into More you cannot come back with the mode button, so press the shutter once instead.
Other Android phones simply pair and go.
Fit the safety strap before you get in rather than at the surface, particularly for scuba or free diving. It keeps your hands free for equalising and signalling instead of gripping a phone for the whole dive.
Care and use
Pressure-test with the vacuum pump before every entry, and check the seal for grit, sand or a stray hair every time you close it. A single grain of sand on a gasket is how housings flood.
Rinse in fresh water after salt or chlorine and dry the housing fully before storing. Remove your everyday phone case before fitting, since an extra case can stop the housing closing correctly.
The depth rating assumes an intact, correctly closed seal, so do not exceed 20 metres.
Frequently asked questions
Why does my touchscreen stop working underwater?
Because water is conductive. It forms a second conductive layer across the glass, so the screen can no longer tell the difference between your finger and the water, and it either ignores you or registers touches everywhere at once. It happens on every capacitive screen regardless of the phone’s own waterproof rating.
My phone is already IP68. Do I need a housing?
If you only want it to survive a splash, no. If you want to take photographs, yes. An IP68 rating means the phone tolerates water; it says nothing about being able to operate the camera while submerged, which you cannot do through the screen.
How deep can it go?
Rated by the maker to 20 metres, or 65 feet, which covers snorkelling and most recreational diving. Always pressure-test the seal with the vacuum pump before entering the water.
Will my phone fit?
It fits straight-screen phones up to 7 inches with a clamping range of 50 to 80 mm, which covers current iPhone and Android models. Remove your everyday case first, because an extra case can stop the housing sealing correctly.
How do I know the seal is good?
Run the air-tightness test before first use: a tissue inside, case sealed, vacuum cover on, submerged empty for at least 30 minutes. A dry tissue means the seal is sound. Then use the pump before every entry after that.
Can I add a light later?
Yes. There are two universal quarter-inch threaded mounts for lights, trays or a diving grip. Those are sold separately.
Is a phone included?
No. It is a housing for a phone you already own.
The short version
Waterproof and usable underwater are different claims. Water is conductive, so a capacitive touchscreen stops working the moment it is submerged, no matter how well sealed the phone is. The only thing that gives you control at depth is physical buttons, which is what a housing adds. When you are comparing them, look for a depth rating in metres, a vacuum pump so you can test the seal yourself, more than one physical control, a stated light transmission figure for the port, anti-fog treatment and a clamping range in millimetres. A housing you cannot pressure-test is a gamble with a phone as the stake.
The products
| Product | What it is | Fits | Price |
|---|---|---|---|
| Underwater Phone Case, 20 m Waterproof Housing | Diving housing with five physical camera buttons and a vacuum pump | Straight-screen phones up to 7 inches, 50 to 80 mm | €70 |
| Master Portrait Grip Kit, 105 mm Optical Lens | Optical lens and camera grip for portraits on land | iPhone 17 Pro and Pro Max, back compatible with 16 Pro and Pro Max | €149 |
Nourish Peak is an independent accessory retailer. We are not affiliated with, sponsored by or endorsed by any phone manufacturer, and a phone manufacturer is under no obligation to service or warranty a device used inside a third party housing.
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