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http://tinyurl.com/y4urwq is another answer on this from Motorola:
Our handsets do not support Thwarte or VeriSign Certificates.

The only security domains currently supported are:
1. Motorola root Certificates.
2. Operator root Certificates.
3. Java Verified UTI Certificate
4. Untrusted

Only options 1, 2, and 3 will give access to protected APIs such as JSR75.

In order to obtain Motorola Manufacturing domain Certification you must obtain an NDA and be sponsored by someone in the business development team within Motorola.

If you want your midlet signed by an operator/carrier. You would need to contact them for details.

For more information regarding java verified certification, information can be found at:

http://www.javaverified.com