This is a quick fix for the TEL attacks described here .
TelStop publishes a TEL handler and will be invoked on every phone call the originates from a TEL URL. TelStop will only show itself if it sees a problem with the URL. You will only see the WARNING screen if the URL looks fishy.
After installing try the TelStop Test Page 
Tags: telstop , telstop htc , how to set telstop as default , how to set telstop as default action , how do i set telstop as the default action , ussd uri list , telstop test