Cell phone providers may charge considerably more for calls abroad. To avoid getting hit with an unexpectedly large bill, check your cell phone policy by reviewing your contract. If you don't have your contract, call your service provider to ask about rates for international calls., Calling cards are prepaid cards that give you a set number of minutes per month. If you're calling from a cell phone, your cell phone provider may require you to use an international calling card when calling abroad. Review your cell phone policy or call your provider to see if you need a calling card.
 Depending on where you live, there may be a big time difference between the time in Guatemala and the time where you're calling from. You can search online to figure the time of day in Guatemala. Do this before you call to avoid disturbing someone by calling very late or very early.
Check your cell phone rates first.
See if you need a calling card.
Account for time difference.
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