Number Pools: Rotate Sender Numbers So Bulk Texts Don't Get Flagged

A Number Pool groups several of your purchased or connected numbers under a single pool. Instead of a workflow SMS or call action sending from one fixed number, it pulls from the pool and rotates which number sends the next message. You set this up under Settings > Phone Numbers once you own more than one number in the sub-account.

This matters most when you run high-volume texting, like a database reactivation blast or a batch of appointment reminders going out in a short window. Carriers watch send velocity per number, and one line firing hundreds of texts in an hour is a common trigger for spam labeling. Splitting that same volume across a pool of three or four numbers keeps each individual number's send rate low and looks like normal conversational traffic instead of a blast.

The caveat: every number in the pool still needs its own A2P 10DLC registration and campaign approval, pooling does not bypass that requirement. Keep the pool small and stable rather than swapping numbers constantly, since contacts who reply may be replying to a different number than the one that first texted them, and that can confuse threading in the conversation view.

How to use it

1. Go to Settings > Phone Numbers
2. Create a Number Pool and add two or more registered numbers
3. Open the SMS action in your outbound workflow and assign it to the pool
4. Save the workflow and monitor delivery for a day before scaling volume

Who it helps

Agencies and service businesses that send large reactivation or reminder blasts to their contact list.

Related: Reactivation campaigns push high SMS volume fast, and number pools are the setting that keeps that volume from getting flagged.