The number for Casa de Olé is:

011-52-638-38-37800

As an alternative, you can also bring down your U.S. cell phone since roaming on the Mexican cellular phone system is usually possible.  Some services are not direct dial, meaning that to make a call back to the states, you may need a calling or credit card. 

Cingular phones are known to work direct and other carriers may also.  You may want to contact your U.S. carrier prior to making your trip for any special information about roaming in Mexico.

In addition, there are many places to make calls while in town.  Of course, most people quickly forget all the reasons they would need to call anyone – ah, life on the beach!