Not keeping lint out of the charging port

When you stuff your iPhone in your pockets or handbag, there’s always a chance for lint to get caught in the charging port. “Lint or dust in the charging port will cause your phone not to charge or for the speakers/microphone to malfunction,” says Kelso. While newer phones have wireless charging, it’s always a good idea to keep that port clear. To clean it out, simply use a toothpick to remove any dust or lint caught in that spot.
By the way, don’t freak out, but your phone screen is way dirtier than you thought it was.
Not turning on “Find My iPhone”

Smartphones may be larger than they were a few years ago, making them harder to lose, but it’s still a good idea to turn on the Find My iPhone feature. “People are constantly losing their iPhones, but if you have Find My iPhone enabled, you can quickly locate that lost iPhone,” says Kelso. To locate a lost phone, just log into your iCloud account on another device and you’ll see where it is.
Not knowing your Apple ID and password

Many people will set up an Apple ID and password as soon as they get an iPhone…and then promptly forget this information. “Your Apple ID comes in handy if you need to download apps from the App Store, or when transferring your information from an old iPhone to a new iPhone, backing up your information to iCloud, and locating your lost iPhone,” points out Kelso. If you set up an Apple ID and forget your password, just visit iforgot.com to reset it.