Smartphones have become our cameras, maps, means of communication and perhaps most importantly, our lifelines in the outdoors. And yet, sometimes we take them on the water, into the rain, with little consideration of how vulnerable they are to moisture.
And whilst most smartphones these days claim some level of water resistance, a single splash or squirt of water can be catastrophic to our cherished (and expensive!) devices.
This is where a waterproof phone case comes in! They provide reliable protection in situations where standard “water-resistant” phones cannot cope.
A waterproof phone case lets you carry your phone confidently while sailing, kayaking, hiking, stand-up paddle boarding or any other occasion when you and your phone are likely to come into contact with water.
This guide explains what waterproof really means, features to look for, and how to choose and care for a waterproof phone case that will genuinely keep your phone safe.
Why Waterproofing Matters - Water-Resistance vs Waterproof
Most modern smartphones include some level of water resistance, but that protection is limited. Manufacturers design phones to survive light splashes, brief rain, or accidental dips - not continuous exposure to water or deep immersion.
When water reaches internal circuits via ports, seams, or speaker grilles, the result can go one of two ways - immediate failure or gradual corrosion. Drop your phone in the sea unprotected, and saltwater accelerates corrosion, further shortening the lifespan of a device.
To understand what “resistance” means in practice, consider the latest flagship phones.
The current iPhone models are rated IP68 under IEC standard 60529, which Apple defines as surviving immersion up to 6 metres for 30 minutes.
Many modern Samsung Galaxy phones also carry IP68 ratings. Samsung states that this typically allows 30 minutes of resistance at depths around 1.5 metres in freshwater.
These waterproof ratings illustrate that even top-tier phones are only protected for a relatively short time and at limited depth.
And then, other extenuating factors can further reduce that claimed protection. A cracked phone screen and water at extremely low temperatures can cause damage fast. Ultimately, in many outdoor or marine environments, the risks exceed what phone manufacturers account for.
A well-designed waterproof phone case serves as a second, more robust layer of defence. It protects the phone in conditions that exceed factory specs: high-pressure waves, inadvertent submersions and exposure to salt water.
What “Waterproof” Really Means
The term ‘waterproof’ is bandied about with little care these days, and that’s why the term ‘waterproof’ should only carry meaning when it is supported by a verified test standard.
The most common is the Ingress Protection (IP) rating, which measures how well a product resists water entry. Here are some common IP ratings for waterproof phone cases.
-
IPX6 indicates protection from strong water jets, suitable for spray or heavy rain
-
IPX7 allows immersion up to 1 metre for 30 minutes.
-
IPX8 extends protection to greater depths and durations, depending on manufacturer testing.
A waterproof phone case rated IPX8 is tested to perform under continuous immersion several metres deep. That means the seal and material integrity remain intact under pressure, not just surface splashes.
No case can protect a device indefinitely underwater, as pressure increases rapidly with depth and temperature changes can affect seals. However, for everyday use on the water, such as kayaking, sailing, or swimming, a properly rated case provides dependable protection.
Indeed, here’s an incredible review of our Compact Phone case from purchaser Jon: “Accidentally dropped my iPhone into the sea. It was underwater for 3 hours in the waterproof case until the tide went out, and I could track its location. The phone was completely dry and fully functional!”
For more on waterproof ratings, read our guide to the IPX scale.
Waterproof Phone Cases - Key features to compare
The exact features required for a waterproof phone case will vary, but here are some general characteristics to consider.
1. Fit and sealing mechanism
A well-designed case uses a closure system that creates an even, continuous seal. Some use a clamp-style lock (this is what we use at Aquapac), others rely on a roll-top or zip seal. The goal is always the same: to create a tight seal to prevent water ingress.
2. Touchscreen usability
Modern case films allow users to operate touchscreens through the material. The best designs maintain sensitivity even when the screen or hands are wet. High-quality films also preserve photo clarity for underwater or near-water photography.
3. Buoyancy and impact protection
A case that floats can prevent total loss if dropped in deep water. Buoyant foam or trapped air in the design ensures the phone surfaces quickly and remains visible. Some phone cases, like our Impact Max Floating Case, also offer phone protection on land too.
4. Visibility and identification
Transparent materials make it easier to see the screen, while coloured edges or reflective panels improve visibility of the actual case in low light.
Some waterproof phone cases can be mounted on a belt, bag or other strap to keep it close at hand. And if that isn’t included, cases are often sold with a lanyard, making it easy to loop a device around your neck. Adjustable, colourful lanyards also make it easier to spot a case if it does land in water.
5. Audio Quality
Cases block water, but that also affects sound. A good waterproof phone case design balances protection with acoustic permeability so users can still hear calls and alerts clearly.
Matching the Right Case to Your Phone and Activities
Different activities create different demands. Choosing the right waterproof phone case is a case of balancing usability and protection.
-
Casual beachgoers and travellers should look for a basic, slim, clear waterproof case that allows for quick photography and touchscreen use.
-
Kayakers and paddleboarders should look for a case that floats.
-
Sailors, marine workers and other outdoor professionals may prefer cases that can be mounted and remain accessible during movement. Seals they can trust, and extra impact protection might also be useful. An additional Safety Breakaway Cord, that disconnects when excess strain is applied, could also save a nasty injury should a phone (and case) get caught on something.
How to Test and Use a Case Safely
Even a premium waterproof case needs routine checks. Users should test each case before first use.
-
Seal the empty case and submerge it in a sink or bucket for five minutes.
-
Press gently under water to simulate movement and pressure.
-
Dry the outside completely, then open it to check for any moisture inside.
If the interior remains dry, the case is ready for real use.
Before sealing your phone, always inspect the closure area for lint, hair, or sand, as even small particles can compromise the seal. Avoid opening the case in rain or spray since any water that enters while opening can become trapped inside.
Whilst it's obviously comforting to know that a phone is safe when inside a waterproof case, it's always a sensible idea to attach it securely when on, or near water.
Common questions about Waterproof Phone Cases
Can I take photos underwater?
Yes, good-quality waterproof phone cases will allow you to take photos underwater, provided the water is clear and well-lit. The lens area should be free from air bubbles or fingerprints. Touchscreen controls work best near the surface where pressure is minimal.
Will the case fog up?
Fogging occurs when warm, moist air inside the case comes into contact with cool water outside. To reduce it, insert your phone when both are at similar temperatures and ensure the inside is dry before sealing .To reduce further reduce condensation, you can use silica gel bags (Desiccant Sachets) inside the case.
Can my phone overheat inside the case?
Direct sunlight can trap heat. If using your phone for GPS or filming, give it breaks in the shade. The waterproof film blocks airflow, so treat it as you would a camera housing that is capable but not immune to heat build-up.
What if the case leaks?
If you ever see moisture inside, remove your phone immediately and dry both the case and device. Inspect the seal for damage and test the case empty before using it again.
That wraps up our practical guide to waterproof phone cases. This simple, but essential, item keeps your device working in environments where water would normally destroy it.
By choosing a case with verified waterproof ratings, inspecting it regularly, and caring for it properly, you can protect your phone and the data you depend on.
Whether you are sailing offshore, hiking in the rain, or just relaxing on a beach, a well-designed case lets you enjoy the moment without worrying about water damage.