Besides the internal storage of your device, you can also use Cloud Storage. Here you can upload your photos and videos, so they no longer have to be on your phone. They remain available on your phone via the Cloud, but do not take up any more space on your phone. In this way, your phone will stay fast and your storage will become much less full. Examples of Cloud storage are iCloud, Dropbox, Google Drive, and Microsoft OneDrive.
You can use two SIM cards with different phone numbers in a Dual SIM phone at the same time. Depending on the model, you can be reached on both SIM cards at the same time, or you can switch between them. This comes in handy if you have both a business and a private number, or a domestic and a foreign number. It depends on your device whether you can set up a separate ringtone for each phone number.
Switching between SIM cards and contacts is very easy, so you're always calling from the right number. The contacts are often sorted by SIM card. This way, you will always call your business contacts with your business number and private contacts with your private number. In a Dual SIM phone, you can also use only one SIM card.
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.
Currently, SIM cards are available in three different formats: regular, micro, and nano. If your SIM card is too small for your phone, you can use a SIM adapter. This way, the SIM card will fit in your phone again. If your SIM card is too big, you can cut it with a SIM card cutter.