HTC ThunderBolt Verizon Thunderbolt Quick Start Guide and User Manual - Page 250
Camera flash doesn't turn on?, You have an incoming call
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250 Camera Camera flash doesn't turn on? The camera flash uses much battery power. To save battery power, the camera disables it (even when it's set on) when one of the following occurs: You have an incoming call The camera flash will be disabled temporarily when you have an incoming call. After the call ends, you'll be able to use it again. If you have set the flash to Auto flash or Flash on in photo mode or Light on in video mode, it turns back on after you answer and end the call. Your phone's battery level reaches 15% or lower Recharge the battery so that the camera can have enough battery power to use the flash. Cold weather may lower battery performance which affects the flash To make sure the camera has enough battery life to power up the flash, keep your phone warm. When not in use, put the phone inside your jacket to keep it warm, and try to avoid sudden temperature changes that may affect battery performance.
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