if the outer glass on the front of the device if cracked/scratched/chipped
if the 'picture' display underneath the front glass is cracked/bleeding
if your iPhone doesn't hold charge/ charge up, or drains quickly
if the button under the screen is stuck or not responsive
if both the glass screen and internal LCD are damaged
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if the back housing of your device is damaged, cracked or scuffed
if you can't hear music through the speaker, or calls in this mode
if the person you are calling can't hear your voice
if you can't hear the person on the other end of the phone
if the 30-pin connector at the bottom is damaged
if the button at the top doesn't turn on or unlock the device
if the switch on the side doesn't switch between modes
if one or both of these buttons is stuck or unresponsive
if the jack is blocked or doesn't recognise ear/headphones
if the device doesn't vibrate for calls or text messages
if you can't see a live feed when trying to use the camera
if the screen doesn't turn off when you hold the device to your ear
if your screen doesn't dim/brighten in different lighting conditions
if you are getting erratic signal for WiFi network connections