i've had my htc sensation for over a year now, and as of recently when i try to add/delete contacts nothing happens. whenever i attempt to remove a number from the sim, it simply stays there. further, whenever i attempt to add new contacts i receive the message "unable to save contact. sim card error." i've tried restarting, removing the sim, cleaning it, etc. to no avail. i'm growing progressively aggravated at the situation and have no idea what else i should be doing to remedy it. can anyone help me out here?