---
title: Check if a number uses iMessage | Sendblue Docs
description: Find out if a phone number or email supports iMessage | iMessage For Business
---

The Sendblue API allows you to call an endpoint to figure out if a number supports iMessage. This is pretty useful to determine:

- Whether a certain phone number is an iPhone or not.
- If a number is real before sending a message.
- Whether to use Sendblue or another provider to send a message.

Use the [/api/evaluate-service](/api/resources/lookups/methods/lookup_number/index.md) endpoint to check if a number uses iMessage.

## Rate Limits

Lookups have their own separate rate limits and do **not** count against your message sending limits.

| Limit                  | Default      |
| ---------------------- | ------------ |
| Lookups per hour       | 30/line      |
| Lookups per day        | 100/line     |
| Maximum (upon request) | 400/day/line |

Increases apply at the account level. Contact your account manager to request an increase.