a man demonstrates a cell phone app
a man is demonstrating how to use a camera on a smart phone
a man is doing a tutorial in taking photos on motorola phone
a man is taking a photo
a man is using a phone
a man talking about a smart phone
a man talking about his phone camera
a man talks about a phone
a person describing the camera feature of a smart phone 
a person explaining features of mobile phone
a person is explaining something
a person is using a cellphone to take a picture
a person showing off a photo app on a phone
a person showing the mobile cam futures
showing how to take a good picture using mobile
someone is giving demo for some phone
someone is reviewing a phone
someone is showing how to use an application
someone is giving demo for some phone
a man talks about a phone