Now that's using your head!
Since this is your daughter's first phone, if I may make a suggestion, add Smart Limits to her line. That way, you can manage the numbers that she can call and the ones that can call her, plus you can prevent her from going crazy with texts and paid downloads. Depending on her age, you can make this an interactive process for her. You can tell her now that she's going to be getting a phone for her birthday in a few weeks, so, between now and then, she needs to get a list together of all the people she would like to talk to, along with their numbers, of course. Then the two of you can sit down and go over it, and you can decide which of them are OK to add to her whitelists. Then, after a trial period, the restrictions can come off if she's responsible with her phone. Not only will it teach her responsibility, but I guarantee that she'll be bouncing off the walls for the next few weeks in anticipation of getting her hands on it.