I do. Why don't you? Are you 6 years old? If you are actually 6 years old, you shouldn't have an iPhone.
In fact, No I don't have it, since I bought it on the DS when it came out last year, so I didn't see the point of having a second time. I had a great time playing it!
I have it, but i stopped messing with it for awhile. I like having a whole bunch of unfinished games to come back to later, no matter how old they get. Working very slowly on still: PvZ, Rolando 2, The Creeps, Sway, GTA-CTW, Doodle Army, Cogs, etc...
I have it, but I haven't played it for a while. Too many other games and sales have appeared that GTA keeps being put to the back.