+52MX
Mexico number screening
Mexico renumbered in 2019, and the leftover +521 prefix is still the single biggest cause of false invalids.
Mobile number format
All Mexican numbers are 10 digits. Mexico City (55), Monterrey (81) and Guadalajara (33) use a 2-digit area code plus 8 digits; everywhere else it is 3 plus 7. The 044, 045 and mobile-1 prefixes were retired in 2019, so mobile and landline are now the same length.
Main carriers
- Telcel
- AT&T México
- Movistar
Telcel's network dominates coverage, with AT&T and Movistar sharing the rest, while MVNOs such as Walmart's Bait scale quickly on the Altán wholesale network. The market is prepaid-first, so lines suspend and revive constantly and status has to be re-checked per batch.
On the ground
Cash still shapes commerce: OXXO convenience-store payment and cash on delivery close a large share of orders, so an unreachable number usually means a cancelled order rather than a lost impression. Mexico also dropped nationwide DST in 2022 (border cities excepted), leaving most of the country on UTC-6 year round, so send schedules no longer shift with the seasons.
Screening guidance
The classic Mexican pitfall is +521. Before 2019 mobile numbers carried a 1 in international format, and plenty of legacy databases and WhatsApp exports still hold 12-digit +52 1 numbers. Normalize everything to +52 plus 10 digits first or your invalid rate is inflated for no reason, then run WhatsApp and layer Facebook, Instagram and TikTok for segmentation.
Key platforms in Mexico
WhatsApp functions as the national address book — quotes, order confirmations and after-sales all happen there, which makes it the one channel you cannot skip. Facebook and Instagram carry acquisition, TikTok grows fastest, and Temu and Airbnb map to cross-border shoppers and short-let hosts specifically.
FAQ
How many digits is a Mexican phone number?
Ten nationally, twelve with the +52 country code. Mexico City, Monterrey and Guadalajara use a two-digit area code plus eight digits; the rest of the country uses three plus seven. Since the 2019 renumbering there is no 044, 045 or mobile 1 prefix, and both mobile and fixed lines are ten digits.
What does +521 mean, and should I keep the 1?
+521 was the pre-2019 international format for Mexican mobiles, where the 1 flagged a wireless line. The official format is now +52 plus ten digits, but WhatsApp and many legacy databases still carry that 1. Normalizing +521 to +52 before import avoids marking large batches invalid for no reason.
Which platform should I screen first in Mexico?
WhatsApp. Commercial conversation in Mexico happens there almost exclusively, so registration and activity decide whether you can reach someone at all. Add Facebook, Instagram and TikTok afterwards for segmentation, Temu for cross-border shoppers and Airbnb for short-let hosts.
Nearby markets
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