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If you have bought this device new, it may appear that the phone's speaker and/or microphone is not working. For example, you may not be able to hear the other party on the phone. This is because this model comes with a protective foil around it. The foil also covers the loudspeaker and microphone, making it seem as if these parts are not working properly. Remove the foil from the front and back to be able to make good use of your phone.
With this model of telephone we regularly hear that one of the speakers does not work. In almost all cases, the design gives the impression that there are two speakers, whereas in reality there is only one. The other "speaker" is actually a microphone, but looks just like a speaker. So this is not a defect: your phone works just as it should.
Your phone's storage space can get full by storing lots of apps, photos, videos, music, or contacts. This is very annoying, because it makes your phone slow and you won't be able to download new photos or apps. Unfortunately, your phone's memory cannot be expanded with a memory card. But there is another solution: use cloud storage. You can upload photos and videos to the Cloud and then delete them from your phone. The files remain accessible on your phone via the Cloud, but no longer take up space on your device. This way, your phone stays fast and you have room for new apps. Examples of Cloud storage include iCloud, Dropbox, Google Drive, and Microsoft OneDrive.
Some phones have the front camera and proximity sensor in the display. The proximity sensor flashes as soon as you bring your phone closer to your ear. It then looks as if you have a dead pixel in the display.
That flashing white pixel is not a dead pixel but the proximity sensor that does its job of turning the screen off while calling to prevent unintended touching.
As a rule, water damage to any electronic equipment is not covered by the warranty. This is because water damage falls under user damage. The manufacturer cannot give a guarantee on this, because they cannot influence the use of the appliance.
Many devices, such as smartphones, smartwatches, and fitness trackers, have a watertightness certificate indicated by a code, such as IP68 or 5ATM. Water damage with these certified waterproof devices is also not covered by the warranty. This is because the waterproof seal of your device may be subject to wear and tear due to normal use. So always try to prevent your device from getting wet, even if it is waterproof.