i can't find any girls fucking while talking on the mobile phone, but i did find a few girls masturbating while on the phone
Romanian girl Jenifer is on a land line phone, lounging in her panties:
http://www.skinfiles.com/galleries/489/free-teen-jenny-pics73.html
Sarah Blue puts a condom on her phone, and then in her pussy:
http://www.freshsexyteens.com/spermlover/070606/wowtgp.html
lovely American beauty Carli Banks in her panties with a phone (i think i have that kind of phone too!)
(http://timdir.com/carli_banks_pantyhose/pornindex.html)
American girl Tiffany Holiday even uses the cell phone to pleasure herself:http://www.ftvmovies.com/2nd/314/stiffy-masturbationtwlgh_prn.html