Screen Mirroring

How could I screen mirror on my tv with a full screen?

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It currently only screens sideways or very small.

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Any suggestions?

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I use an AllCast dongle it mirrors whatever is on my phone whether it is horizontal or vertical. Occasionally the picture is very small on the TV screen, that is due to the source video, nothing to do with the phone as far as I can tell

I have chromecast and not everything goes with it. For instance when i try to view videos through magisto it only works when i use screen mirroring.

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