I have friend that purchased the HTC Thunderbolt and kept it about a week and didn't like it because she was having problems with her email and text messaging and Verizon would not take the phone back because she threw away the box. So, she has switched back to AT&T and has it for sale cheap and I am buying it from her. Now, to my question. Will I have to get a new sim card from Verizon to use this phone?