Oh well, it appears from rubio's post above that there was no need for me to spend the extra pesos and hassle of upgrading to Full service. But I've got no complaints. I'm now using my iPhone as a Personal Hotspot for my iPad to send this message. The tethered iPad is 5 times faster on the Claro service than it was on my hotel's WiFi. But unlike rubio's experience with his Android, I did not have to adjust any APN settings on my iPhone. I don't even know how you would do that on an iPhone. I simply inserted the cut-to-size Claro SIM card, turned on the iPhone, and gave it about a minute to find the new service.