What I discovered from my friends and my time there is that English is not widely spoken. When I was travelling, the bus has to make some changes to the route and I was confused and not a single person in the Bus could speak English. Finally they had to find someone from outside the bus to help me. So telephoning may not be very helpful unless you speak Turkish.
If you have no luck, please pm me and I am happy to ask my Turkish friends to inquire on behalf of you. But they are away for couple of weeks.