---
title: Send Your First Blue Message in Sandbox
description: Learn how to add and register a recipient to your Linq number by sending a simple inbound message. Start messaging in just a few steps.
---

[Skip to content](https://help.linqapp.com/how-to-send-a-imessage-#main-content)

English

Show submenu for translations

[![Cube-Linq-w](https://help.linqapp.com/hs-fs/hubfs/Cube-Linq-w.png?width=200&height=89&name=Cube-Linq-w.png)](https://linqapp.com/?hsLang=en)

Open main navigation

Close main navigation

- English
  
  Show submenu for translations
- [Go to linqapp.com](https://linqapp.com/)

[Go to linqapp.com](https://linqapp.com/?hsLang=en)

 How can we help?

- There are no suggestions because the search field is empty.

1. [Help Center](https://help.linqapp.com/?hsLang=en)
2. [API](https://help.linqapp.com/api?hsLang=en)
3. [Sandbox](https://help.linqapp.com/api?hsLang=en#sandbox)

May 13, 2026

# Send Your First Blue Message in Sandbox

## Register a phone number by sending your first message

#### **Add a Recipient to Your Linq Number**

To start sending messages to a new recipient, you’ll first need to register their phone number with your Linq number.

### **Instructions:![](https://help.linqapp.com/hs-fs/hubfs/image-png-May-05-2026-08-59-41-1117-PM.png?width=300&height=264&name=image-png-May-05-2026-08-59-41-1117-PM.png)**

1. Open the messaging app on the phone you want to add as a recipient
2. Create a new message
3. Enter your Linq number as the recipient
4. Send the message "**Hello World**"

### **What Happens Next?**

Once the message is sent, the phone number you used will automatically be recognized and added as a recipient in your Linq account. You can then begin sending and receiving messages with that number through Linq. 

### **![](https://help.linqapp.com/hs-fs/hubfs/image-png-May-06-2026-12-51-05-5634-AM.png?width=278&height=206&name=image-png-May-06-2026-12-51-05-5634-AM.png)**

### **Notes**

- The content of the message ("Hello World") is simply used to initiate the connection—no additional setup is required
- Make sure the message is sent from the phone number you want to register

- [Linq Blue](https://help.linqapp.com/linq-blue?hsLang=en#main-content)

    - [Linq Blue Subscription](https://help.linqapp.com/linq-blue?hsLang=en#linq-blue-subscription)
    - [Linq Zero](https://help.linqapp.com/linq-blue?hsLang=en#linq-zero)
    - [Integration: GHL](https://help.linqapp.com/linq-blue?hsLang=en#integration-ghl)
    - [Integration: Salesforce](https://help.linqapp.com/linq-blue?hsLang=en#integration-salesforce)
    - [Integration: HubSpot](https://help.linqapp.com/linq-blue?hsLang=en#integration-hubspot)
- [Linq One](https://help.linqapp.com/linq-one?hsLang=en#main-content)

    - [FAQs](https://help.linqapp.com/linq-one?hsLang=en#faqs)
    - [Linq App](https://help.linqapp.com/linq-one?hsLang=en#linq-app)
    - [Admin Dashboard](https://help.linqapp.com/linq-one?hsLang=en#admin-dashboard)
    - [Products](https://help.linqapp.com/linq-one?hsLang=en#products)
    - [Troubleshooting](https://help.linqapp.com/linq-one?hsLang=en#troubleshooting)
- [API](https://help.linqapp.com/api?hsLang=en#main-content)

    - [Sandbox](https://help.linqapp.com/api?hsLang=en#sandbox)
    - [API Resources](https://help.linqapp.com/api?hsLang=en#api-resources)

[![Cube-Linq-w](https://help.linqapp.com/hs-fs/hubfs/Cube-Linq-w.png?width=197&height=88&name=Cube-Linq-w.png "Cube-Linq-w")](https://linqapp.com/?hsLang=en)

linqapp.com Help Center

Copyright © 2025, Linq