Thanks for the comments, everyone, and I apologize if the photos disappeared for awhile. I slightly exceeded Photobucket's bandwidth limit, so I had to fix it by upgrading to a premium membership.
You are probably right about the SIM card, willzzz88. I still have my old Turkcell SIM card from 2008, and I should have thought about asking if it would be possible to add units to it while I was at the Turkcell shop. I actually felt a little uneasy about that SIM card when I got it in Antalya, because no one asked for my passport. My teaching schedule varies from semester to semester. It's usually a combination of operations management, management science, statistics, or international business.