You don't trade for it, you find it in the cave at the Mountains of the Moon, along with the Red Jewel. Climb the trail, letting the second goat butt you up to the next level. Get the Opuntia Fruit (cactus fig) and climb up to the ice cave. Beat the old man at Mancala and you can enter the cave, collecting the phone and red jewel.
(see related question)
In Nabooti.
At the merchants in Nabooti.
You don't trade anything. You find the cell phone in the ice cave at the Mountains of the Moon. You have to beat the old man at mancala. (see related question)
There are 3 traders back in Nabooti.
411,911,111,211,611,511,811,011,000,544,1112,212,122.
When you have the cell phone on Nabooti Island, dial 1225 and you will get a removable ELF hat and a bag of toys. (see related question)
you take it back to Nabooti and go to the merchants and trade it for a camera.
Get the Egyptian Blue Lily from the left side of Blue Nile Falls, and trade it for a turban at Nabooti.
There isn't a phone on Poptropica's Time Tangled Island. There is a cell phone on Nabooti Island.
You can't trade the Nabooti jewels once you get them.
its in the bottom in one of the caves on nabooti island
5556789