I have been using my iphone 5s for more than 4 years and it still works great. I only had to change my battery (i had to do it myself) and apart from that i got no problem. Changing battery is the pain in the ass but you have to do it for once in 4 years! Also the best thing is i heard that its getting ios 12 too! Its 2018 and i have still most updated IOS version on my 4 years old phone. In my opinion IOS is the best operating system for smart phones because it is very stable and simple. I know there are a lot of people are saying Apple makes their products slower in time but to be honest i never experienced slow down issue. The only problem was battery and i solved it by getting another one. To sum up if you are looking for durable phone which you can use for many years i would suggest you to get an iphone. I think iphone SE would be a great choice. Iphone 5s is living its last days but SE however will be in the game for a very long time. By the way its not that expensive too. 

Siri is the virtual assistance in iphones which is an AI based program . As you know in all the iphone models siri is activated by holding down the home button. In iphone x there is no home button so in order to activate siri you have to push down the side button at the right side of the phone. when you double tap the side button of right side  then the phone will open apple pay  which is the new way of paying bills without having debit or credit card.

Many iphone 7 or similar models users don't know that they can make scientific calculations in the iphone.  you may be an engineer or a science student who needs an calculation, for example, making exponential, trigonometric, logaritmic calculations or taking a degree root of a certain number. You can use iphone's calculator  to do these calculations.
Thus, you have learn the procedure to do these calculations. Firstly, you have to open the calculator application in the phone. After that , rotate the phone into a horizontal position instead of a vertical position, then you will see that basic calculators turns into a scientific one. This transformation occurs automatically as long as your device works properly. If the screen of your phone does not rotate, your phone is likely to have a problem. ıf it works as expected, you can make scientific calculation for your homeworks or projects usefully.
 

In spite of being more connected to each other than ever before, Privacy concerns are a thing..
To help keep your device safe from hackers, or any other prying eyes, it’s recomended that you turn off USB accessories.
To do this, in iOS 11.4.1:
Tap on Settings > Touch ID & Passcode (or on the iPhone X Face ID)
Enter your passcode.
Scroll down to USB accessories>
Make sure it is turned OFF.
This will prevent USB accessories from connecting to your device when it has been locked for over an hour.

To access the below features in lock screen, make sure to enable them in Settings -> Touch ID & Passcode.

In iOS 11, you can access many features when your iPhone screen is locked. Usually you can go to notification center by swiping down from top after unlocking your phone. Now you can bring up all the notifications, by swiping up from the middle of the lock screen. All the notifications will be listed by day and you can scroll down to see the older notifications. 

From the lock screen, you can open the camera by swiping to the left. Today's view of Widgets will appear if swipe to the right of lock screen. Touch the 3 dots below 'Press home to open' and swipe up to open the ‘Control Center’.

You can access Apple Pay stored cards by double-clicking the Home button, if 'Double-Click Home Button' is enabled in Settings -> Wallet & Apple Pay.

You can activate Siri to search from lock screen. If enabled, you can return missed calls and also reply to messages from lock screen.

There is no direct print option available to print a text message from WhatsApp in iPhone. One easy way is to copy the WhatsApp message text into notes and use the print option from notes. Notes could retain all the formatting from the WhatsApp message and the message comes out good in the print out. If you have wireless printer set up in your iPhone, you could easily print out WhatsApp messages using this option. 

If you have a document in Google Drive and want to share with others through available options, you won't find it easier to do this in iPhone. There is no direct option to share a file from Google Drive in iPhone. The closet sharing option is to use 'Send a Copy' or 'Open in' features. 

In iOS 11 with the introduction of File App, you can share any document in your Google Drive easily as you share a photo in iPhone. 

To share a file from Google Drive using Files App, open the Files App and go to 'Browse' section. Navigate to the file that you want to share in Google Drive. Touch and hold the file name to open contextual menu. Use the right scroll arrow to go and pick 'Share' option. Now you can see all the available options to share the file.

If you want to group all the related folders for easy access from cloud storage (Google and iCloud drive), you can use the 'Tags' feature of the Files App to do this in iOS 11. 

Open the Files App and go to 'Browse' section and select the drive in which you stored the folder. Navigate to the specific folder and touch and hold the folder to open the contextual menu. Select 'Tags' that will open the Tags screen with the list of already created tags. You can add the folder to one of the available Tags, or create a new tag using 'Add a New Tag' option at the top. 

Repeat these steps to add multiple folders to a tag. Once all the folders are added to a tag, they will be available for quick access under the particular tag in 'Browse' section. 

Currently this feature is not supported for OneDrive, but still you can browse OneDrive content using Files App. 

If you want access a specific folder in cloud storage often, you can add it to the Files App favorites list in iOS 11. When you add a folder to the Favorite list, it will be visible in the Favorites section of the app for quicker and easy access later.

To add a folder to the Favorites, open the File App and use 'Browse' option to go a folder at a particular storage. Hold the folder to bring the contextual menu. Once you add the folder in the ‘Favorites list', it will be available in the 'Browse' section of the Files app under favorites. This will save you few navigation steps and time if you access a folder frequently by going to the location of the folder in cloud storage. 

To remove a folder from Favorites, go to ‘Browse’ option of Files App and Tap 'Edit' on the top right corner. Touch the ‘-‘at the left of a folder and tab the ‘Remove’ button at the right. 

In iOS 11 files App Tags are provided to organize and group relevant or frequently used files that can be accessed quickly later. Tagging can be very powerful if it is used properly to quickly access and track files in different storage. There are few default tags with labels and colors come with the app and you can also create new tags. 

To change the name of the existing tags, go to ‘Browse’ option of Files App and Tap 'Edit' on the top right corner. Now you can touch the name of a tag and edit the name. 

To delete, touch the ‘-‘at the left of the tag and tab the ‘delete’ button at the right. 

To rearrange a tag, touch and hold handle at the end of the label name and drag and drop to a place that you want. 

Create Tag option is available only when a file is tagged. 

Go to any file and touch and hold a file to bring the contextual menu. Go to the right of menu bar and select ‘Tags’. Now you'll see an option 'Add New Tag' at the top of the Tags list to create a new Tag. In the Add New Tag screen you can give a name and color to create a new Tag. 

It's a fantastic feature added with iOS 11 files app to organize and access your files quickly, if you’re using multiple cloud services for file storage. You can tag the files stored either in iCloud Drive or the other cloud storages like Google drive, OneDrive, etc. Once you tag the frequently used files, they can be accessed quickly instead navigating and going through the folders to find them. 

You can assign files to the available default tags, or create your own tag with a label and color. To add a tag to a file, browse to a particular file location and hold on the file.  Contextual menu will open up from which you can select a tag to assign to the file. In the same screen you'll see an option to create a new tag as well. 

After adding a file to a tag it'll be available at the browse section under that tag for quicker access later. You can tag a single file to multiple tags. 

In iOS 11 and above, you can send cash to family or friends through iMessage. You have to set up the Apple Pay Cash Card by adding a debit or credit card prior to using this feature. Once this is set up, you can bring the Apple Pay within the iMessage to initiate a transaction. You can set the dollar amount that you’re requesting or paying and complete the transaction. Once the transaction completes, amount will be available instantly in the wallet to use.

If you would have enabled High Efficiency format for photos and videos in your iPhone, they will be automatically saved as HEIF and videos as HEVC files. If you need the photos and videos to be converted to the compatible format when exported or shared, go to Settings > Photos and enable Transfer to Mac or PC to Automatic. After this it will automatically transfer the photos (as JPEG) and videos in a compatible format. 

 iOS 11 supports HEIF (High Efficiency Image Format) for photos and HEVC (High Efficiency Video Coding) for video. Photos and videos stored in these formats offer much better compression than JPEG format that helps to save storage in iPhone. Once you enable this format at  Settings > Camera > Formats and select High Efficiency, your photos will be automatically saved as HEIF and videos as HEVC files. 

If you want to add more controls or change default choices in your Control Center, you can do this by going to Settings > Control Center > Customize Controls.
 
Here you can add the available additional controls such as Apple TV Remote, Stop Watch, Magnifier, etc. you can also remove or reorder the items in a way you like.

Live Photos is a fantastic feature in iPhone that captures few seconds of action at the beginning and end of each photo shot. However this takes more space than a regular photo which is also not necessary for every occasion. 

When you want to take regular single shot Photos most of the time, it's better to turn off Live Photos. To turn off the Live Photos, touch the yellow (when it's turned on) circle at the top of the Camera. Once turned off, yellow circle will turn it to white. This method of manually disabling Live Photos will last only for that particular camera session. If you close the camera and open again, Live Photos would have been turned on again. 

If you have to make the preference of Live Photos stay permanently then go to Settings -> Camera -> Preserve Settings and enable Live Photo. This'll preserve your Live Photos preference.