Text message "invalid recipient" fix

I have been seeing a lot of people on various forums complain about when they try and send a text they get an invalid recipient message. You must be rooted to fix this. In Root Explorer go into the CUST folder. Inside will be a cmcc, dualcu, and hw folder. (Lost+Found & Preinstalled you don't have to worry about) Go into cmcc--->cn--->xml and delete the mms_config.xml file. Do the same for the dualcu and hw folders. Then restart your phone. You will not get the invalid recipient message any more.