Roaming with your own cell phone is possible if you have a GSM phone but it is expensive. You may want to buy a SIM card from a Telcel or Movistar outlet. You can buy credit for your SIM card in supermarkets, newsstands, online, etc.
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The reality is that all cellphones will work outside of usual usage zones. However, a few things visitors to Mexico should be aware of when using a cellphone. First, you must make sure whether your smartphone can connect to the cellular networks that are frequently known to work in the region or area.