What is the infrared sensor of the Iphone 4s?

[kar120c]

Read in the tech spec that from Iphone 4s ti 5s has equipped them with an infrared sensor.
What is means?

 

[kch50428]

It detects when you're holding the phone up to your ear...

 

[kar120c]

thanks

 

[kataran]

Welcome to iMore Kar

Some cases interfere with the sensor so avoid cheaply made ones


iMore Ambassador -iPhone 5s

 

[IAmSixNine]

Some screen protectors can cover that sensor as well and cause it to not function properly.

 

[kar120c]

Only first quality cases for my 4s. My favourite is Speck Pixelskin HD