As of August 3, 2019 phone calling will be much simpler. The 01, 044, 045 will be gone for national calling as will be the "1" on international calls and the need to add a "1" after 52 when calling a Mexican cell phone from another country.
Local calls: all numbers will be 10 digits. In Mexico City for example, 551-234-5678 will be the format.
Cell phone calls: you only have to dial 10 digits. Example: 551-234-5678.
National calls: whether you call from a cell phone or landline, you will not have to dial 01.
International calls: if calling from abroad to a cell phone number in Mexico you will no longer have to add 1 after the 52. Example: 52-331-234-5678. In the case of calls from Mexico to abroad, nothing changes.
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