LG LGD321 - Manual (Page 29)

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Tap to delete the previous character.
Entering special characters
The on-screen keyboard allows you to enter special characters (e.g. "á").
For example, touch and hold the desired key (for example, the "a" key). After the
desired character appears, slide your your finger over it and lift it off to enter it.
NOTE: A character at the top right corner of a key indicates that additional
characters are available for that key.