# What is a per-number daily cap and why set one?

A per-number daily cap is the maximum number of calls a single number may place in a day. Caps spread volume across your numbers and keep any one number from being over-used, which protects deliverability and number health.

You set the cap on the pool inside the campaign editor. A pool with no cap shows the infinity symbol on the Phone Numbers page and rotates without a per-number ceiling. If one number is getting overworked, set a per-number daily cap on its pool.

Read online: https://docs.closemagnet.com/articles/questions/per-number-daily-cap