External flash with phone?

Will an external flash, such as one used for photography with DSLRs, work the same as my phone flash?

Can I use my phone flash and have the same results as an external flash you buy off nikon or canon?

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What is wrong with my DSLR Camera?

i own a Nikon d3200 DSLR Camera and when ever i shoot a picture a black mark appears in the top left corner of the file. It is not the Lens because when i swapped it it continued to happen.

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Battery in a Nikon D90 stuck?

I borrowed the camera from my college, and went to take the battery out to charge it today and it wont come out? I wasn't the one who put it in, and so I don't know how it was put in. Does anyone know how to get it out safely?

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