Phone System · 1 min read
Why SMS in Mexico May Show a Different Number
Sender ID behavior in Mexico
- Mexican carriers have strict rules on SMS sender IDs.
- Texts sent from long codes (regular numbers) may have the sender number replaced with a random or shared number.
- Some carriers occasionally allow person-to-person texts from regular numbers, but this isn't consistent.
Volume and sender changes
There's no official rule on how many texts trigger a change, but carrier anti-spam systems are more likely to replace the sender when many messages are sent quickly.
What this means for you
- Recipients may not recognize the sender number.
- Replies may not reach your number if the sender was replaced.
Recommendations
- Put your business name at the start of every message.
- Give recipients another way to reply, such as a link to your site or a WhatsApp number.
- Send at a steady pace rather than in bursts.