Do you often get falsely and frustratingly autocorrected when typing/texting on your iPhone? 
There’s a quick and easy solution!
Thinking of the words you commonly type on your phone; whether it be an address, name, or even a naughty word .. it can be “ducking” annoying when you’re constantly autocorrected to the wrong words! When you’ve thought of some words you’d like to add to your iPhone’s dictionary, follow the following steps:
Step 1: Settings
Step 2: General
Step 3: Keyboard
Step 4: Text Replacement
Step 5: Plus button (top right corner)
Step 6: insert your word or phrase
Step 7 (optional): Add a shortcut to automatically expand into the word or phrase inserted in step 6. E.g. when typing my shortcut “em” it automatically expands into “Emma”

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.
 

This isn't in anyway a 'cool' tip or something that will change the way you view the iPhone all together, but it is a little trick that has saved me from a lot of frustration since learning about it. 
For the longest time whenever I made the mistake while I used the calculator, I would just hit the 'C' button and zero the calculator, and start over. But, if you are looking just to remove the last number of what is appearing, all you have to do is to swipe left or to swipe right in the black area surrounding the number. 
It doesn't seem like a lot, but for someone who is constantly using a calculator for the work that I do, it is definitely something that I greatly enjoyed figuring out as it has saved me a lot of time and effort since learning about it.

In iOS 12, new spark line chart is added after the symbol that shows the price movement throughout the day. Now you can view the news stories for a stock without leaving the App. By touching a stock symbol opens up a scrollable screen showing the detailed chart with key information followed by the recent news about the stock.

Main screen of the app includes top stories that will feature business news and the full article can be viewed without leaving the Stocks app. Stocks app in iOS 12 also includes after-hours stock price once the market closed.

Have you ever been placed onto hold by an automated computer system when all you wanted to do was go and talk to a human? well on essentially every automated system there is a bypass to this! simply type 0 on ANY phone (landline, cellphone, etc.) and you will automatically be patched through to a human! Stuck talking to the automated systems is a thing of the past with this simple tip. Talking to an automated system will never result in the system mixing up call the technology department to something ridiculous like end call. I personally have used this tip to save tens of hours that would have kept on hold with an unrefined program. 

First, make sure that 3D Touch is enabled on your iPhone. Pull up your iPhone keyboard and then 3D Touch anywhere on the keyboard. Do not remove your finger from the keyboard. This should turn your keyboard into a trackpad/mouse and you can move your finger to where you want your cursor to move. This makes it easy to edit/add to long texts that you have written.

Add a receipt or form to a note. Tap the Plus icon, then tap Scan Documents. Notes automatically senses and scans the document, straightens and crops it, then adds it to the note.

Rather than using the typical 4-digit or 6-digit passcode, you can make sure your IPhone is even more secure by using an alphanumeric passcode. An alphanumeric code allows the usage of both letters and numbers in the formation of a custom passcode. Thus, the use of an alphanumeric code allows for a nearly unlimited number of possible combinations.
This minor setting adjustment is simple to accomplish. First open the 'Settings' app on your IOS device. From there, tap the 'Touch ID and Passcode' option, followed by 'Change Passcode'.  Once given the opportunity to submit a new passcode, tap 'Passcode Options' located above the keypad. In doing so, you will be offered further options for your passcode customization. From these options, select the 'Custom Alphanumeric Code' option, and enter your own custom code.