Telephone icon
What does a telephone icon mean on my 5 iPhone?
iPhone 5c
What does a telephone icon mean on my 5 iPhone?
iPhone 5c
If there is a phone icon with a an arrow pointing right, it means call forwarding is on.
If there is a phone icon resting on some squares, it means Teletype is on.
See here: Status icons and symbols on your iPhone - Apple Support
This is at the top of the iPhone. Next to where the battery status is
Telephone icon