i havent heard of this and i work for tmobile. if you have overage charges from the dropped calls you can get credits sometimes. but the company doesnt have to credit you.
my cell phone tip is not calling 411 for 1.49/call , instead, send a text message to googl. see
http://www.google.com/sms/ standard text charges will apply.
or call your phone company and ask if you are on the best plan for your usage. or if their are any specials.