There's no cell phone in the game. The yelloiw item needed for that quest is called sticky notes.
I have all of thoughs, It was the black 1 w/ the antennae coming out of it that I believe u only need 2 of.
My game 2day suked like crazy though, only good thing was that I got 2 white choclates XD
Oh and my 2nd eggplant XD
On a side note from that I will say I am way slow. I just realized 2day that my grandam has a wireless keyboard. OMG this thing is awesome, although I will say it is a bit weird having the keyboard on ur lap & playing. XD