Repair

1. f you need to send in an iPhone that's paired with an Apple Watch, unpair your devices. When you unpair, your iPhone will create a new backup of your Apple Watch. You can use the backup to restore your Apple Watch when your iPhone returns from service.
2. Back up your iOS device.
3. Go to Settings > Messages and turn off iMessage.
4. Go to Settings > [your name] > Find My [device], then turn off Find My [device] to disable Activation Lock. Enter your Apple ID password, and tap Turn Off.
5. Erase your device. Go to Settings > General > Reset > Erase
6. All Content and Settings. If asked, enter your passcode and Apple ID password. If you can't erase your device because it won't power on or isn't responding, you can erase it from iCloud.com. Learn how.
7. Remove any SIM card, case, or screen protector from your device and keep your cable and charger.

You need to remove the activation lock at the very least.

If you want to send it to them without actually deleting the data, you can do that, but don't expect it to be there when you get the phone back...

Apple will NOT guarantee that any data on the device will be intact following repair.

Make SURE you have a backup of your data before you send it for repair.

If you did not make a backup prior to breaking it, and are unable to do so now, you may as well consider your data gone.

Then don't get it repaired.

I don't make the rules.

It does not backup the apps but you can download again.

Yes.