NUMERIC TextField with max length

Hi there guys,
could someone tell me why TextField's get a 10 number max length automatically when it's assigned a NUMERIC type to it? Even if I set it's max length to more then 10.
I know it doesn't happen in most of cellphone's models but I've already noticed it in Palm J9 and in Sony Ericsson W810. Is this an specification? What can I do to increase max length and keep with NUMERIC type TextField?
tks to your attention.

One more case of device fragmentation and weak implementation.
The javadoc for TextField.setMaxSize does say<quote>
Returns:
assigned maximum capacity - may be smaller than requested.</quote>db

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NUMERIC TextField with max length

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