If you have your dialing preferences set to confirm a phone number before dialing, you might notice some extra characters on international numbers.  If you have the phone number on the contact card set with a preceding "+" and the preferences set to start International dialing with 011 then the dialing string will look like: 
011 "extra character" 4412341234
This is a known issue,  current workaround is to dial without confirming numbers.