Not a "stupid" question at all.
If you don't want to call or receive calls from home then a phone is unnecessary. You can have someone at your hotel or restaurant can call a driver for you or you can just use the "route taxi" system.
Once you get a "driver" and you like the way he moves, ask him for his number or just have him pick you up at a certain time at a certain place. Make sure you get the fare correct before you get in the car. If you don't do that, it can be a learning experience that you don't need.
Don't fret about a phone. Most everyone has a cell and will call for you when you need to make a call. You just may need to give them a few J's for phone credit.
Peace and Guidance