I having this same problem. I get a text from 5555 and it says someone is accessing my messages go on Verizon and change your password and gives me the IP address of who is accessing it. 2nd time in 1-2 weeks I've had to change it. When this happens not long after I get a text for my yahoo instant password because I have it set to send a password to my phone. The IP address is from Los Angeles, California. I have the IP address if that will help.