Move your devices to another charging dock
Disconnect all cables
Do this for 30 minutes, and your devices should be fully charged. Maintain 100% iPhone battery health .
Turn on the device
Open the Settings app
Click on General
Scroll down and tap Airplane Mode
Device lighting issue
Go to Settings > Lighting
Toggle Night Shift
Can’t figure out what’s wrong with your device? Take it to an Apple store. You can also contact AppleCare, an Apple Authorized Service Provider or an Apple Repair Center.
What should I do with my iPhone 3GS?
The 3GS isn’t completely dead yet. You can still use it, but it won’t work as good as it used to.
Get a new battery
Restart your phone
Press and hold the Sleep/Wake and Home buttons
Now go to Settings > General > Reset and select Erase All Content and Settings
To install a new battery:
Go to an Apple Store
Take the device in and get a new battery
For more iPhone tips, check out How to Reboot or Revive an iPhone (With Apple TV)
iPhone 4 and iPhone 4S
Why is the iPhone 4 or iPhone 4S unable to call 911?
According to Emergency911.org, if you have a 3G iPhone 4 or iPhone 4S, you can no longer dial 911 directly, nor can you send a text to 911. You can, however, call emergency services from an iPhone. The instructions are very similar for the iPhone 4 and iPhone 4S, so it’s unlikely that there’s a problem with 911. So, if you’re calling 911 from an iPhone 4 or iPhone 4S, you may see a screen telling you that you can’t send texts, only make calls.
How can I turn off Emergency 911 while using my iPhone?
There are two ways to stop Emergency 911 from calling and sending texts. You can first go to Settings > Emergency 911. Then, you’ll find a button labeled “Stop Sending Texts And Calls.”
Or you can just go to Settings > General > Reset.
How can I turn off Emergency 911 while using my iPhone 4?
You can turn off Emergency 911 while using your iPhone 4 and 4S in Settings > Emergency 911. First, tap “Stop Sending Texts And Calls.”
Or, you can just go to Settings > General > Reset.
iPhone 3GS/4 and iPhone 5
Can’t make calls to 911?
Make sure the Emergency Calling app is turned on. You can download it from the iTunes Store. Go to Settings > General > Texting & Calling and turn the Emergency Calling app on. Tap the “+” button and then “Answer,” “Ignore” and “Call Back” in the menu at the top.