I also have been having the same issue for 3 years. I have gotten a new SIM card, done a factory reset, I have even gotten a new phone. Hours and hours on the phone with customer service. It's the line, it is NOT my phone. I am so frustrated. I work from home half of the time and my cell is the only way for work to reach me. I have taken time off to fix it. The issue needs to be resolved. I have seen many many people that are dealing with the same issue. This is not ok!