Hot answers tagged dialog
For the most part I would go with a dedicated 'Cancel' labelled button rather than an 'x' on mobile. The target area is generally to small for the user to have a fluid interaction. If you make the 'x' a bigger target area it can be used. A good size might be the one used for delete options(red -). It seems to work quite well for apple so far. Not exactly ...
I would recommend going with the cancel option since most users might not be used to the concept of using the close icon (the X) to close a dialog in a mobile app (you have them in websites) but then with a mobile app the common affordance to what I have found is to to have a distinct cancel option as shown below:
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