iMessage Isn't Working On My iPhone 7 Plus! Here's Why & The Fix!

1. Open the Settings app.
2. Tap Messages.
3. Scroll down and tap Send & Receive.
4. Look for a check next to your phone number under "You can be reached by iMessage at" and "Start new conversations from".
5. If there isn't a check mark next to your phone number, tap it to give your iPhone the ability to send and receive iMessages.

There are two ways to turn Wi-Fi off and back on again:

Turn Wi-Fi Off And Back On Again In The Settings App

1. Open the Settings app.
2. Tap Wi-Fi.
3. Tap the switch next to Wi-Fi.
4. You'll know Wi-Fi is off when the switch is gray.
5. To turn Wi-Fi back on, tap the switch again.
6. You'll know Wi-Fi is on when the switch is green.

Turn Wi-Fi Off And Back On Again In Control Center

1. Swipe up from below the bottom of the screen to open Control Center.
2. Tap the Wi-Fi  icon.
3. You'll know Wi-Fi is off when the  icon is black inside of a gray circle. 
4. Tap the icon again to turn Wi-Fi back on.
5. You'll know W-Fi is on when the icon is white inside of a blue circle. 

1. Open the Settings app.
2. Tap Messages.
3. Tap the switch next to iMessage. You'll know iMessage is off when the switch is positioned to the left and gray.
4. Tap the switch again to turn it back on. You'll know iMessage is back on when the switch is green and positioned to the right.

1. Open the Settings app.
2. Tap Messages.
3. Tap Send & Receive.
4. Tap your Apple ID at the top of your iPhone's display.
5. Tap Sign Out.
6. To sign back in, tap Use your Apple ID for iMessage.
7. Enter your Apple ID (if necessary) and Apple ID Password.
8. Tap Sign In.

1. Open the Settings app.
2. Tap General.
3. Tap Software Update.
4. Tap Download and Install or Install Now.
5. Enter your passcode if prompted.
6. The update will begin once it has been verified.
7. The update is complete after your iPhone restarts.

1. Open the Settings app.
2. Tap General.
3. Scroll down and tap Transfer Or Reset iPhone.
4. Tap Reset.
5. Tap Reset Network Settings.
6. Enter your passcode if prompted.
7. Your iPhone will shut down, reset, and turn itself on again when the reset is complete.

How To Repair Your iPhone With Apple's Mail-In Service

1. Visit Apple's support website to begin the online mail-in repair process.
2. Alternatively, call 1-800-MY-APPLE (1-800-692-7753) to set up a repair.

How To Repair Your iPhone At The Genius Bar Inside Your Local Apple Store

1. Visit Apple's website to make a Genius Bar appointment before you go into the store. Apple Stores are extremely busy, and if you don't have an appointment, you may have to wait for hours or end up being turned away. (Editor's note: I'm a former Apple tech and we're not exaggerating — please, do yourself a favor and make an appointment first!)
2. When you arrive, go to the Genius Bar to check in for your appointment.
3. Genius Bar appointments always include free diagnosis. If you're under warranty, many repairs can be done on the spot, but it all depends upon which parts are in stock. If you're not under warranty, the Genius will give you a quote for the cost of a repair.