How can I get rid of a trojan on my nokia n95

Hello,I am pretty sure I've got a TROJAN on my Nokia N95-8gb phone. This malware continues to send msg. to 2 phone no. that I don't know. So,this fuls my "send sms box" and also the phone's memory gets down. Please,HOW CAN I GET RID OF THIS TROUBLE ? I should like a free downloadable app.(software) via WAP(from the net) CAPABLE TO DETECT & REMOVE THE TROJAN! I have NetQin Antivirus instaled that tels me the phone has no viruses.
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