# Understanding Message Delivery Issues on WhatsApp

When you send a message on WhatsApp and it appears sent but not actually delivered, a few different things might be happening. Here's a simple breakdown of the most common reasons, along with some solutions you can try.

### Common Reasons Your Message Wasn't Delivered

1. **The recipient hasn't been online** in the last 30 days, and we can't hold messages longer than that.
2. **You've been blocked** by the person you're trying to message.
3. **The recipient is in a** [**country** ](#country-restrictions)where we can't deliver messages due to restrictions or sanctions.
4. **Technical issues** like invalid request parameters, integrity errors, or the recipient not accepting the latest Terms of Service and Privacy Policy. If it's the latter, have them click [here](https://wa.me/tos/20210210) to accept the terms.
5. **Outdated WhatsApp version.** Make sure the recipient is using at least the following versions to receive messages:
   * Android: 2.21.15.15
   * SMBA: 2.21.15.15
   * iOS: 2.21.170.4
   * SMBI: 2.21.170.4
   * KaiOS: 2.2130.10
   * Web: 2.2132.6
6. **The recipient is part of an** [**experiment**](https://developers.facebook.com/docs/whatsapp/cloud-api/guides/experiments)**.**
7. **To ensure a high-quality experience** for users, we [limit ](https://docs.gallabox.com/connect-whatsapp-channel/messaging-limits-and-quality-ratings#new-marketing-message-limitations-in-india)how many marketing messages people can receive.

### What You Can Do

If your message hasn't been delivered, try these steps:

* **Check if they can message you.** Make sure the recipient can actually send a message to your WhatsApp business number.
* **Ask if you're blocked.** Have them check their blocked list to see if your number is there.
* **Terms of Service.** Make sure they've accepted the most recent terms by directing them to the appropriate settings in their app.
* **Update WhatsApp.** Encourage them to update their app to the latest version.

### Country Restrictions

Certain countries and regions can't use the WhatsApp Business Platform due to sanctions. This includes:

* **Not eligible for businesses:** Cuba, Iran, North Korea, Syria, and parts of Ukraine (Crimea, Donetsk, Luhansk).
* **Not eligible for users to receive messages:** The same as above plus, users in Turkey can't receive messages sent via the API, though businesses in Turkey can still use the platform.