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 
Now supports HTC devices in transparent mode.
Other devices (Moto, Samsung, ...) will follow.
Please report problems.
Fully transparent mode, will only bug you if it detects a malicious TEL URL.