Did you know SIM chips could go bad?

I have been having problems with my phone lately so T-mobile decided to try replacing the SIM card. They said if you're having trouble and it has been a long time since your SIM has been replaces, you might need a new one. It seems they do wear some going from one phone to the next. Also, as mobile technology evolves, they can have minor incompatibility issues with newer phones. Well, that is what T-mobile said... So this is your basic Public Service Announcement!