Hello, I have an odd problem with my Samsung Galaxy S... I bought it in January, put the GSM SIM card that I was using in my old cell and everything worked perfectly. Yesterday I turned the SGS off and then turned it on because it was not correctly reading mp3 files. Now the phone does not recognize my GSM SIM card and it only allows me to make emergency calls. Has anyone had a similar problem before and can help me? Thanks in advance!!!