I had an old phone from AT&T that i got almost 2yrs ago and i kept on getting horrible service and when i went down to santa barbara because that's where im going for college, i had absolutely no service while my mom's phone worked perfectly fine. I thought it was my cell phone's fault so when i came back to the bay area i picked up my mom's old samsung phone but it still have few dropped call and the connection isn't very great which worries me in santa barbara. I'm thinking it might be my SIM card that's scratched but could that make my service bad or what else could it be?