Specifications

iPhone 4 Verication Testing — Functional Testing 183
2012-02-21
Test Buttons and Switches
1. From the Home screen, open any app, then press the Home button to return to the Home
screen.
2. Press the volume up/down buttons along the left edge and look for indicator on the display
that sound level is changing.
3. Flip the Ring/silent switch back and forth and look for a bell icon on the screen. IPhone
should vibrate when placed in silent mode.
4. Press the On/o button on the top edge to put iPhone into sleep mode (the screen will go
blank). Press this button again to wake iPhone.
Test Ambient Light Sensor
The ambient light sensor (ALS) automatically adjusts the display brightness to an appropriate
level for the current ambient light conditions. The ALS brightens the display when using iPhone
in a bright light environment, and dims the display in low light.
1. Press the On/o button to put iPhone into sleep mode.
2. In a bright light environment, cover the top third of the front of iPhone to block the light
(the heel of your hand works well). The ALS is located near the receiver.
3. Press the On/o button to wake iPhone, then slide to unlock. While the ALS is covered, the
display should be dim.
4. Uncover the top of iPhone. After a few seconds, the display should return to normal
brightness.
Test Proximity Sensor
The proximity sensor detects when iPhone is held close to the user’s ear and immediately turns
o the display to save power and prevent unintended touches.
1. From the Home screen, launch the Phone app.
2. Call an approved toll-free number for testing.
3. Cover the top front of iPhone with your hand. The display should go blank.
4. Remove your hand. The display should turn back on when the sensor is uncovered.
5. End the call.