Add words to the dictionary of the iPhone

The spelling corrector is one of the characteristics of the "made by Apple" telephones which many speak about. Some complain about its inefficiency, and others of its unflexibility. Since version 2.2 of the firmware, one can finally disactivate it completely… But before arriving at that point, here how to better control it.
The corrector is supposed "learn" words that one uses often. If you write several times in the memo pad a word with a fault, and you refuse the suggestion of the dictionary, it will end up no longer propose modifications to you. However the fact is that this training does not hold, and in a short time it "forgets" and returns to the original correction.
Here the discovery of Erica Sadun intervenes (Creator of several applications for the iPhone and a writer recently for Ars Technica). She found that the field of text that is taken into account and remembered by the dictionary is the research field of Google in mobile Safari! One wonders really what pushed Apple to put this characteristic at this place!
Thus henceforth, if you use original words, abbreviations, or if you had enough of the erroneous suggestions, all you have to do is to launch a research in Google (you are not obliged to await the results); I carried out some tests, and for the moment the added words are recognized by all the applications of the iPhone.
For those which have a jailbroken iPhone, the file which keeps the additions for the dictionary is the following: /private/var/mobile/Library/Keyboard/fr_FR-dynamic-text.dat