Why can't I hear sounds from apps on my iPhone?

ACM

New member
The only time I can hear them is when I put ear phones on, but other than that I can't or sometimes i can. Like for example the virtual lighter from Zippo. Sometimes I can hear when I flip the lighter on and sometimes i can't, and when I want to hear it guaranteed I have to put on ear phones. Why is this? Can it be fixed?
 
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