I cannot get any phone call when my iphone is sleeping

Hi,everyone. I cannot get any phone call when my iphone is sleeping ( or locked ). After I active my phone, it will show how many call I missed. Does anyone have the same problem with mine? I tried reset, update software, but still not working.

to put your iPhone to sleep follow these steps:
1) press the sleep button once - screen will go dark and you'll hear a click.
2) press home button once - screen will light up with your wallpaper in the background, time, date, etc.
3) DO NOTHING for five (or so) seconds and then your iPhone will sleep.
if you receive a call, iPhone will wake automatically. otherwise to wake the iPhone, press the home button - iphone will wake. slide the unlock bar (enter pass code, if enabled) and use.
to return to sleep mode, repeat sequence (1 through 3)
doing this will allow calls to come through while Iphone is asleep and prolong the battery charge exponentially.

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