Researchers at Infobyte security research labs have discovered that a twitter client for Blackberry- UberTwitter- sends users' personal information to UberTwitter's servers each time it is started. The information sent includes:

    * Personal Identification Number BlackBerry (PIN)
    * Phone Number
    * e-mail
    * Physical Location of equipment

http://blog.infobytesec.com/2010/07/ubertwitter-your-secret-spy.html