PHONES THAT WORK IN MEXICO: Depending on your plan, phones with the following US carriers can work in Mexico: Choose Your Carrier AT&TBoos InfiniteConsumer CellularCricket WirelessMetro by T-MobilePrepaidSprintT-MobileUS CellularVerizon Wireless AT&T AT&T has extensive coverage throughout Mexico, most of it on their own newly upgraded network. They now offer  "AT&T Mexico Roaming Bonus" to Mobile Share Value consumer and business customers for free which allows unlimited texting to anywhere in the world and unlimited voice calling within Mexico and from Mexico to the United States. Additionally, customers will get 1 GB of data to use while in Mexico (with overage charges of $20 per GB). BOOST INFINITE With Boost's roaming add-on, North America Connect, you can make calls, send texts (both SMS and MMS), or use your phone with 5GB of roaming in Mexico or Canada for just $10/mo. First and most Calls and Texts must be in the US. To ensure you have uninterrupted data while traveling to Mexico and Canada, make sure Data Roaming is toggled ON in your phone settings. CONSUMER CELLULAR Consumer Cellular has coverage throughout Mexico. There is a small charge for calls FROM Mexico: .01-.06 per minute Talk, .01-.06 per Text and .01-.06 per MB of Data, and International Roaming must be enabled. Wi-Fi Calling is available. CRICKET WIRELESS Cricket is a prepaid service owned by AT&T. Cricket phones will work in Mexico for Talk, Text and Data at no additional charge with the $50 and $60 plans and mostly uses the AT&T Mexico network. METRO BY T-MOBILE Metro by T-Mobile is a prepaid service that roams in Mexico with an add-on that gives you the same Voice, Text, and Data allowance while Roaming in Mexico as you have in the US. Limited to plans $40 and over. Depending on when you add the feature, the "Mexico Unlimited" plan is either Free or $5/month. Yes, Metro roams on the same networks as T-Mobile. T-MOBILE T-Mobile phones work well in Mexico and reports are they use multiple networks. T-Mobile's regular plans allow you to roam in Mexico with either reasonable, or no, additional fees. Their "Mobile without Borders" plan allows you to roam in Mexico (and Canada) with no additional charges for Voice, Text or Data. This includes calls TO & FROM the US, Mexico and Canada with Data included, with download speeds up to 4G LTE rates, if you can find it.  T-Mobile Pay-As-You-Go phones will also roam in Mexico but the per-minute rate is very high. T-Mobile's "Wi-Fi Calling" app allows voice calls made through wi-fi at no additional charge but in light of their broad roaming capabilities, Wi-Fi calling is a better option for where you have no cellular signal but do have Wi-Fi. US CELLULAR US Cellular phones with postpaid plans can roam in Mexico, although your roaming ability is phone model-dependant. Rates include a $3 per day surcharge, plus $.99 per minute, plus any pass-through toll charges from the foreign carrier. Text and Data roaming are not currently available. VERIZON Older Verizon phones have limited roaming capabilities, but if your Verizon phone finds a signal, it will work. Newer Verizon phones will roam on one of the GSM networks. They offer Mexico plans which allow roaming in Mexico for about $15 more than regular plans. Data roaming charges are $.005/KB ($5.12/MB). Plans without free Mexico Roaming, incur a charge of .99 per minute for both incoming and outgoing calls within Mexico. Text Messaging in Mexico is .50 Sent, .20 Received. Both postpaid and prepaid Verizon phones work in Mexico at the same per-use rates. Verizon offers a Global Data Roaming option. While it's not cheap it could prevent you from getting surprisingly high foreign data roaming charges. PREPAID PHONES There are several prepaid phones and plans that will work in Mexico, some are preferred over phones from the above Postpaid carriers.