Let's say you want to call someone while you're in Los Cabos. The number you are going to dial depends upon where you are and what phone you are using. The rules for phone dialing are different for land line and cell phones.

The area code for Los Cabos is 624.

Dialing within Mexico:
Land line to local land line phone - dial the seven digit number (i.e. 143-1234)
Land line to long distance land line phone - dial 01 then the ten digit number (i.e. 01-612-123-1234)
Land line to local cell phone - dial 044 then the ten digit number (i.e. 044-624-122-1234)
Land line to long distance cell phone - dial 045 then the ten digit number (i.e. 045-612-123-1234)
Cell phone to local or long distance land line - dial the ten digit number (i.e. 624-143-1234)
Cell phone to local or long distance cell phone - dial the ten digit number (i.e. 612-122-1234)

Dialing into Mexico:
To dial a land line phone - Dial 011-52 then the ten digit number (i.e. 011-52-624-143-1234)
To dial a cell phone - Dial 011-52-1 then the ten digit number (i.e. 011-52-1-624-122-1234)

Dialing from Mexico to the US/Canada
Dial 001 then the ten digit number (i.e. 001-303-333-3333)

Dialing from Mexico to the rest of the world
Dial 00 then the Country Code and phone number

Dialing US Toll Free Numbers
For 800 numbers - dial 001-880 then the seven digit number
For 866 numbers - dial 001-883 then the seven digit number
For 877 numbers - dial 001-882 then the seven digit number
For 888 numbers - dial 001-881 then the seven digit number