ted

I would say plain no to using any cell phone antennas. Of course, very likely they will work somehow, maybe being better, or maybe worse than a piece of wire. But they are definitely not optimal, and most likely perform badly. The antennas are on these frequencies always tuned and dimensioned for quite narrow frequency band. Those antennas are for either 900 MHz or 1800-1900 MHz and therefore not good for 2400 MHz.

I think it would be not bad idea for you to read antenna FAQ and similar discussions to get an idea what is considered to be a real antenna for WiFi. If you want something that works, you can either see a "cookbook" solution form the antenna discussions, or buy a ready made antenna from some supplier. (you get even info about the suppliers by reading the FAQ and relevant discussions. And do not forget the search facility here.... You see, everybody has been a newbie and had to dig sources of information and doconsiderable self study. It is better to try to research and really learn the stuff than assume that all the questions can be explisitely answered by somebody here.

Btw. I am not trying to be sour to you, but only give some general advice before some of our old-timers gets tired of answering the very fundamental and basic questions n'th time.

Good luck,
Ted