Where do you see status icons
Status icons appear in the status bar on your iPhone. On iPhone X and later, the essential icons appear in the top-left or top-right corner of the screen. If you don't see an icon, check Control Center by swiping down from the top-right corner.
iPhone X and later
iPhone 8 and earlier
About the status icons on your iPhone
To learn what an icon means, find it below.
You’re in range of your cellular network and can make and receive calls. If there’s no signal, "No service" appears.
Your carrier’s LTE network is available, and your iPhone can connect to the Internet over that network. (iPhone 5 and later. Not available in all areas.)
On your iPhone with Dual SIM capability, you’re in range of your cellular network and can make and receive calls. If there’s no signal, "No service" appears.
Your carrier’s 3G UMTS (GSM) or EV-DO (CDMA) network is available, and your iPhone can connect to the Internet over that network.
Your carrier’s 4G UMTS (GSM) or LTE network is available, and your iPhone can connect to the Internet over that network. (Not available in all areas.)
Your carrier’s GPRS (GSM) or 1xRTT (CDMA) network is available, and your iPhone can connect to the Internet over that network.
Your carrier’s EDGE (GSM) network is available, and your iPhone can connect to the Internet over that network.
You can use Wi-Fi calling. Your carrier also appears next to the icon.
Your iPhone is connected to the Internet over Wi-Fi.
You’re connected to a network using VPN.
An app or website is using Location Services. A hollow 
means that an item may receive your location under certain conditions.
There’s network activity.
Call Forwarding is on.
Airplane Mode is on. You can’t make calls or use Bluetooth until you turn off this setting.
Teletype (TTY) is on.
Orientation Lock is on. Your screen won't rotate until you turn off this setting.
Do Not Disturb is on. This setting silences calls, alerts, and notifications until you turn it off. Alarms will still sound.
Your iPhone is syncing with iTunes.
Your iPhone is locked with a passcode or Touch ID.
Your iPhone is paired with a wireless headset, headphones, or earbuds.
An alarm is set.
This icon shows the battery level of your iPhone. If this icon is yellow, Low Power Mode is on. If this icon is red, then your iPhone has less than 20% charge.
The battery level of your paired Bluetooth device.
Your iPhone is connected to the Internet through the Personal Hotspot of another iOS device.
Your iPhone is charging.
Your iPhone is connected to CarPlay.
If you see blue, green, or red in the status bar
On iPhone X and later, the color shows as a bubble behind the time. On iPhone 8 or earlier, the color goes all the way across the status bar. Here's what each color means:
Your iPhone is either providing a Personal Hotspot or an app is actively using your location.*
You're on a call.
Your iPhone is either recording sound or your screen.
* For Personal Hotspot on iPhone 8 or earlier, you can also see how many devices joined your hotspot. 
appears in the status bar of iOS devices using Personal Hotspot.
AirDrop
Cellular
Airplane
Hotspot
Bluetooth