To call Costalegre from a Canada/USA Land Line use the following procedure.  Dial the International access code from Canada (011), then the country code for Mexico (52), then the local area code (315), then the local number.  Note: In Jalisco area codes can be two or three digit numbers. (Guadalajara is 33)

Long distance calls to Canada/USA are accessed by first dialing 00 then the country code which is 1 for both Canada and USA, then the area code plus the seven digit number. 

(Eg: Victoria International Airport 001-250-953-7500)

In 1999 the phone numbering system was changed to match up  with the rest of North America.  Local telephone numbers will be seven digits, with a two or three digit area code.  It will probably take a few more years before the whole country is converted.  In Costalegre often only five digit numbers are listed, but from a pay phone you must dial all seven numbers.  For example to call the tourist bureau in Barra de Navidad from Canada or the USA you would dial 011.52.315.355.5100, but locally you would only dial 355.5100.  In some local areas, you only have to dial the last five digits.

For National long distance with-in Mexico, you have to dial the national long distance code (01) before dialing the two or three digit area code, and then the number.  For example to call the Hotel de Legazpi in Melaque from Puerto Vallarta dial 01.315.355.5397.  For cellular telephones dial (01), then the ten digit number.

Any unlocked Smart phone may be activated with a Mexican number by purchasing a new chip at a local cellular store. There are various voice, text and data plans available.  A data plan will allow you to access your emails and browse the Internet anywhere there is cellular coverage. 
Telcel Amigo plans    Movistar plans

Many visitors buy a Pay-As-You-Go cell phone which can be purchased from $400+ Pesos. Usually 50 to 100 minutes are included in this No Contact deal. Make sure you are joining the same company network (Telcel, Movistar, etc) as your friends or relatives.  You may re-charge your phone with minutes at any OXO or KIOSCO corner store or any cellular store, or on-line from the TelCel Website.  TelCel cell phones work in Canada on the Rogers network.

To Dial a local cellular number from a Landline Phone within the (315) area code, dial (044), then the number.  When you are outside of the area code (but still within Mexico), dial 045 and then the 10 digit phone number. Cell phone to Cell phone only requires the 10 digit number.

Telcel Customer Service (Mexico City)  Weekdays 8am-8pm, Weekends 9am-6pm.
From the USA: 1.888.350.4035,  From Canada: 1.877.837.5618.

Pre-paid Mexican phone cards (tarjetas telefonicas) can be purchased at small stores and shops in $30, $50, $100 peso amounts.  The are used for local calls at Pay Phones.  Tel-Mex charges a peso per minute.  These cards are highly recommended for local calls from phone booths.  To use a prepaid phone card, pick up the receiver, insert your card and wait for the balance to show on the display before dialing.  Normally there are instructions on the phone booth.  When buying a phone card for payphone use, specify that you would like a tarjeta LADA.  Note: Pay phones do not accept coins.

Directory assistance dial (040).  For collect or person-to-person calls within Mexico dial (020).  For collect or person-to-person calls to outside of Mexico, dial the international operator at (090).  Bear in mind that the operators will probably not speak English.