If you've just bought a Samsung Galaxy S25 Ultra and noticed a small slot or hole next to the USB-C port at the bottom, it's normal to be a little puzzled. Between that perforation, the speaker grille, and how hard the USB-C cable sometimes goes in,It's easy to think that something is wrong or that the phone has a factory defect.
The reality is much simpler: That slot has a very specific function within the phone's design. And the firm "click" of the USB-C connector is also intentional. At the same time, the S25 Ultra is one of Samsung's most ambitious phones in many other aspects (design, cameras, screen, AI…), so understanding what's going on at the bottom of the phone helps you use it with more confidence and avoid surprises.
Galaxy S25 Ultra design and changes at the bottom
Samsung has positioned the Galaxy S25 Ultra as a rather aggressive refinement compared to the previous generationIt's not a radical change, but several key details of the casing have been tweaked to improve comfort and consistency with the rest of the high-end range.
One of the most striking aspects is the weight loss to about 218 gramsIt weighs approximately 15 grams less than the previous model. On a large phone, this is very noticeable when using it with one hand or carrying it in your pocket, and it also affects how it sits on stands or charging docks.
The chassis is now slightly thinner, about 15% less thickThis necessitates reorganizing the phone's interior and redistributing components, especially at the bottom, where the USB-C port, main speaker, microphones, and, depending on the version, the SIM tray are located.
Another important adjustment is in the corners of the frame, which are now less sharpIn the previous model, the edges would dig into your hand. The S25 Ultra maintains the "Ultra" aesthetic, but the grip is more comfortable. This smoothing is also noticeable near the base of the phone, where the charging port and various openings are located.
On the back, the camera module is better integrated with the rest of Samsung's high-end range. The rings surrounding the lenses look more like those on the brand's foldable phones.creating a more unified design. While this may seem unrelated to the USB-C area, it's part of the same approach: every hole, perforation, and slot in the chassis is there for a reason; they aren't randomly placed.
What exactly is the slot next to the USB-C port on the Galaxy S25 Ultra?
If you look closely at the bottom of the S25 Ultra, you'll see several elements: the USB-C charging and data port, the main speaker grille, and one or more smaller perforationsThat's where doubts usually arise.
Esa small slot or hole that you see near the USB-C It usually has three possible functions depending on the model and region, but in the S25 Ultra its main role is very clear:
- Main microphone for calls and audio recording.
- In some designs, SIM tray ejection hole if the tray is located at the bottom.
- Additional drilling for aesthetic symmetry or audio support next to the speaker grille.
On the current Galaxy S25 Ultra, what you'll see closest to the connector is, in practice, a tiny microphone tasked with picking up your voice During calls, it also provides audio information for videos and recordings. Samsung concentrates the main speaker, the USB-C port, and part of the microphone system in this lower area, making the most of the internal space.
Furthermore, it is common to find a grid with several aligned holeswhich corresponds to the bottom speaker. In its pursuit of symmetry, the design might give the impression of more "mysterious" gaps than necessary, but what you actually have are three very clear components: speaker, microphone, and USB-C port. Depending on the variant, the SIM tray may be on the side or integrated into the base with its own hole for the SIM eject tool.
What's really important is understanding that slot It's not a second USB-C port, nor a mechanical cable lock, nor a hidden buttonInserting a needle, a pin other than the official SIM tray pin, the tip of the cable, or other metallic objects can damage the microphone or internal components.
Why does the USB-C cable go in so "hard" into the S25 Ultra?
Many users comment that, upon first getting the phone, The USB-C connector seems to require more force than normal when plugging it in.As long as there are no strange noises, sparks, or connection drops, this behavior is usually within expectations.
On the one hand, Samsung has opted for a The USB-C female port fits quite firmly.This ensures the cable stays securely in place and doesn't come loose easily while you're playing games, watching videos, or using your phone while it's charging. The internal tabs of the connector, being new, offer more resistance at first, resulting in a "tight" feel.
On the other hand, the device is designed to offer high resistance to dust and splashes within the usual certifications for the range. This implies small tolerances and a very tight internal fit, so it's not surprising that the port feels stiffer compared to more modest phones or those with many years of use.
It's always a good idea to check that the cable is working correctly: no burrs, no metal deformations or damage to the plastic areaIt's also a good idea to check that lint, dust, or dirt hasn't accumulated inside the port, something that often happens over time when you carry your phone in your pocket.
If the cable is fully inserted, you hear a click, the phone charges stably, data transmission is not interrupted, and no error messages appear, then normally it is That hardness will decrease slightly with use and stay in a firm but comfortable anchor.
On the other hand, if you have to apply much more force than seems reasonable, The cable stops working, you notice sparks, excessive heat, or the charging is interrupted.The sensible thing to do is stop and contact technical support. The USB-C port is durable, but if it's forced at an unusual angle or with damaged cables, it may end up needing physical repair.
The lower section as a connectivity and audio hub
The area where the slot next to the USB-C is located is not just an aesthetic detail: It is one of the phone's busiest areas.That's where a large part of the wired connectivity and sound system is concentrated.
From the USB-C port you can Charge the battery, transfer data, connect accessories, and output video to compatible monitors. using adapters or hubs, and generally using the terminal as a connection center for other devices. For all of this, it is crucial that the connector is stable and fits precisely.
Very close by is the main microphone, which works together with other microphones distributed throughout the chassis to offer Cancellation and ambient noise reduction in calls and recordingsThat discreet perforation is what allows you to be heard clearly even in noisy environments.
If you continually cover that slot with a poorly cut case, with your finger while you talk, or if you hit it with sharp objects, The audio quality may degrade significantly.It is not uncommon for some sound problems to be due simply to dirt, lint stuck to the microphone mesh, or third-party protectors that do not fit the opening properly.
USB-C, data speed, and the role of the included cable
Beyond the shape of the port and its sturdiness, there is a delicate point: the data speed of the Galaxy S25 Ultra's USB-CSamsung has opted to maintain USB 2.0 type specifications, which translates to approximate transfer rates of 40 MB/s.
On a top-of-the-range mobile phone, some users believe that This is a significant limitation, especially when moving large volumes of photos and videos.Today, with much faster USB-C standards available, it's a bit shocking that the flagship model is stuck at that speed.
To this is added that the USB-C cable that comes with the phone It's perceived as a very modest accessory for the price of the device. In a context where it's already been partly accepted that chargers won't be included in the box for environmental reasons, the inclusion of a cable that many see as "outdated" or limited in terms of data speed is generating debate.
The practical explanation is that Samsung assumes that Most users sync and back up their data wirelessly. (cloud, WiFi, automatic backups, etc.). But that doesn't mean wired connections are irrelevant: they remain key for those who transfer large videos, work with their mobile phone connected to their computer, or use advanced features like desktop environments.
High-end hardware: processor, screen, and memory
Aside from the port, the Galaxy S25 Ultra maintains a top-tier hardware profile. Inside, we find the Qualcomm Snapdragon 8 Elite processor, a next-generation SoC that improves performance in gaming, video editing, complex photography and, especially, in artificial intelligence tasks.
The RAM and storage configurations are placed in the premium tier of Android, with combinations that allow Smooth multitasking, very fast application opening, and enough space for high-resolution videoslarge photo libraries and resource-intensive apps.
The screen has also taken a small leap: It goes up to about 6,9 inches diagonallyWith even slimmer bezels to keep the phone's physical size from increasing. It maintains a highly effective anti-reflective coating, which greatly facilitates reading outdoors and reduces annoying glare.
To protect this panel, Samsung is launching Corning Gorilla Glass Armor 2A glass screen designed to better withstand scratches and accidental impacts. This is especially important in a large device, where any drop tends to significantly damage both the edges and the area near the connector.
With this setup, the S25 Ultra is not only ready to run demanding games or professional apps without breaking a sweat, but It also offers remarkable physical resistance in sensitive areas. such as the bottom frame, the USB-C outline, and the speaker area.
One UI 7 with Android 15: renewed interface and AI everywhere
In terms of software, the Galaxy S25 Ultra comes with One UI 7 based on Android 15, probably one of the biggest facelifts Samsung has ever done to its interface.
The overall interface has been greatly refined: Redesigned icons, a more modern look, and better organized menusVisually, everything is cleaner, and the abundant menu of advanced options that has always characterized the brand is maintained, but presented in a less overwhelming way.
One of its greatest strengths lies in its support policy: Samsung maintains seven years of system and security updates for this model. This places the S25 Ultra among the Android elite in terms of lifespan, which is a good fit given its powerful hardware and high price.
At the level of artificial intelligence there is a change of focus: Gemini becomes the default assistanttaking a central role in the daily experience. Image generation is significantly improved, with more realistic and spectacular results.
Among the new features, the following stand out: call recording with automatic transcriptionAvailable in Spain, this app is very useful for interviews, taking work notes, medical consultations, and handling paperwork over the phone. Some of its AI capabilities now run directly on the device, without always relying on the cloud, which increases privacy and response time.
The system integrates a contextual widget that adapts to your routineIt displays useful information based on the time of day and your recent usage. It also includes a screen selector that analyzes what you see to generate GIFs, take screenshots, copy text, or suggest quick actions—all designed to make AI not just another app, but a seamless integration into your daily mobile experience.
As a bonus, the S25 Ultra comes with six months of access to Gemini Advanced at no cost, allowing you to exploit more advanced AI functions and get even more out of the processor's power.
Galaxy S25 Ultra cameras: continuity in photos, plus in video
In photography, the S25 Ultra maintains a configuration very similar to that of the previous generationIt features a 200-megapixel main sensor. This sensor provides an extremely high level of detail and great flexibility in both good lighting and challenging nighttime or indoor scenes.
The zoom system again resorts to a double telephoto lens, with 3x and 5x magnificationcomfortably covering most portraits and mid-range shots. This combination allows for considerable compositional flexibility without resorting to aggressive digital zoom.
The most notable hardware change is found in the ultra-wide-angle lens, which It goes from 12 to 50 megapixelsThis leap is noticeable in landscapes, architecture, or large interiors, with an increase in detail that even allows cropping the image without compromising quality.
The most noticeable improvement is in video. The Galaxy S25 Ultra It debuts the option to record in LOGThis logarithmic format records a very flat image, without intense color or contrast processing. This is invaluable for anyone editing videos in professional software, as it allows for ample room to precisely adjust the final aesthetic and color.
In addition, they are added professional video tools such as zebra patternsThese features highlight overexposed areas on the screen. This function, inherited from high-end cameras, helps to better control lighting and prevent highlights from being blown out.
Samsung and Qualcomm have fine-tuned the real-time noise reduction engineIt can distinguish between moving subjects, static subjects, and changes in the scene, applying the appropriate processing to each case. The result is cleaner video, with less grain in low-light conditions and more consistent detail reproduction.
Versions, prices and colors of the Galaxy S25 Ultra
The Galaxy S25 Ultra confidently takes its place at the very top of Samsung's catalog, and that's reflected in their storage options and their price range exclusive dealer for Spain.
These are the configurations and prices announced for the Ultra model:
- Galaxy S25 Ultra 256GB | 1.459 euros.
- Galaxy S25 Ultra 512GB | 1.579 euros.
- Galaxy S25 Ultra 1TB | 1.819 euros.
The family is completed with the Galaxy S25+ and standard Galaxy S25 models, which offer other tighter memory combinations depending on the budget:
- Galaxy S25+ with variants of 256 and 512 GB of storage.
- Galaxy S25 “normal” with options of 128 and 256 GB.
As for colors, the S25 Ultra is launching in a palette that ranges from classic to eye-catchingBlue, black, silver and gray as base tones, along with special finishes such as deep black, rose quartz and emerald, some of them exclusive to the Samsung online store or certain sales channels.
With all this context, the famous slot next to USB-C makes more sense: it's part of a carefully designed package in which every hole, every grille, and every component on the underside It has a reason for being, whether it's for the sound, the microphone, the SIM card, or the stability of the connector itself.
By understanding what each tiny hole does, why the USB-C port fits with that extra bit of firmness, and how it all fits together in such a complete mobile phone, It's easier to enjoy the S25 Ultra without paranoia and without putting the needle where it doesn't belong., taking full advantage of its camera, screen, AI and connectivity capabilities without putting its most sensitive areas at risk. Share this information and more users will know what the slot next to the USB port on the Samsung Galaxy S25 Ultra is for.
