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Think of BlackBerry and you think of a keyboard: while the Z10 doesn't have a physical QWERTY, it does have a smart onscreen one.
Like other systems, it uses predictive text to suggest the next potential word in the sentence, but it does it in-line with the letters being used, rather than a bar at the top (although this is an option). In the example above, it is suggesting likely words beginning with 'h' as well as 'j' in case that first letter was a mistype.
To insert one of the suggested words, you just swipe upwards; to delete, you just swipe backwards. The messaging application also accepts voice input.
In order to make typing more accurate over time, not only does it learn by scanning emails and texts (all done locally) but it also has a virtual second keyboard underneath the on screen one. So, if as you use the device, it realises you always hit the outer edge of the 'S' button, for example, it will very slightly shift the alignment of the keys to make sure you hit the one you intended.