I really don't think you can get a helicopter in gta 3 for the ps2. But there is a thing on the game called the Dodo. It's like a half car half plane type of thing. It's on Shoreside Vale near the airport.
You can find the helicopter in the third island but you cannot ride on it
You can only while doing airport missions or Go to the casino theres one on the roof
this MIGHT work. i dont have gta 3 but i've seen a walkthrough of it. in one mission you go to a casino i think and theres a helicopter on the roof. you can try to get in it but it could be locked.
there is a helicopter cheat for gta sa PS2 its CIRCLE, X, L1, CIRCLE, CIRCLE, L1, CIRCLE, R1, R2, L2, L1, L1
You don't actually mention which GTA game you mean. Suggest you have a look at the cheats and mods section on the gtawikisite for more information.
gta4.net's garage, search it up for gta3
no.
there is no phone in gta3 you can use. you must be thinking of gta4. press up 2 times on the d-pad.
By cheating
gettherefast
you can't.
you can find plains in the airport