Using Your Cell Phone
All major carriers have plans that now include voice calling in Mexico. We have AT&T and our plan includes FREE unlimited calls, data, and texts in both the US and Mexico. Plan options change all the time, so before your next visit give your carrier a call to see what they're currently offering.
If your carrier doesn't include an inexpensive data plan, be sure to turn "cellular data" and "data roaming" off while you're still in Arizona. There are a few spots in the desert before Lukeville where my phone found it easier to tap into the Mexican cell towers than the US ones. Another aspect of using your cell phone without cellular data is that you won't have access to your voicemail (nor any indicators of how many people called or left a message). For many carriers, incoming texts are free (even internationally), so change your outgoing message to ask people to text you instead of leaving a voicemail.
All resorts have WiFi available, usually in the Lobby area, Pool area, and/or in their business center, and many are now Fiber Optic connections at 30-50Mbps. Almost all condos have individual routers, but there are still some condos that don't (Sonoran Sky and Princesa). BE SURE to check the description of the condo to confirm. Please see our chart of resort differences.
Non-Fiber Optic connections will have much slower speeds, especially when the resort is busy and everyone is sharing the bandwidth.