Can I add a line with ATT and drop one?

[Lisa Hodges]

Okay, let me explain. Right now, there is a deal going on for the HTC Pure phones. If I add a line, I can get the phone for 1 penny. Now, if I went ahead and added this new line, could I drop my other line without getting in trouble? (We have 2 on our family plan, and I am the secondary user). I kind of wanted another phone number without paying to change it anyway.
Understand what Im asking? Drop a line, then re-add one just for the new phone and phone number.

Thanks!