If your text messages suddenly stop sending—or you see errors like “Message not sent”—it can feel frustrating, especially when everything else on your phone seems to work fine. In many cases, the issue isn’t your signal or your SIM card—it’s your Message Center Number (SMSC).
This guide walks you through what the SMSC is, why it matters, and exactly how to change it on both Android and iPhone, step by step.
What Is a Message Center Number (SMSC)?
The Message Center Number is the server number your phone uses to send SMS messages. Think of it as the “post office” for your texts—every message you send first goes through this number before reaching the recipient.
If the SMSC is:
Missing
Incorrect
Reset after a SIM change or update
…your messages may fail to send, even if calls and mobile data work perfectly.
When Should You Change the SMSC?
You might need to update your Message Center Number if:
You recently switched SIM cards or carriers
You reset your phone or updated your OS
SMS messages are not sending, but receiving works
You see persistent “failed to send” errors
Before You Start
Make sure you have the correct SMSC number for your carrier
(You can get this from your carrier’s website or customer support.)
Ensure your SIM card is properly inserted and active
📱 How to Change Message Center Number on Android
Android devices allow more direct access to SMS settings, though steps may vary slightly depending on your manufacturer.
Method 1: Using Default Messaging Settings
Open your Messages app
Tap the three-dot menu (⋮) in the top corner
Go to Settings
Look for Advanced or Text Messages (SMS)
Tap Message Center or SMSC
Enter the correct number
Tap Save
Method 2: Using Hidden Phone Menu (Works on Most Devices)
If you don’t see the option in settings:
Open your phone dialer
Dial:
*#*#4636#*#*
Tap Phone Information
Scroll to SMSC
Enter the correct number
Tap Update
Method 3: Using SIM Toolkit (If Available)
Some carriers include SMS settings in the SIM menu:
Open SIM Toolkit or SIM Services
Look for SMS Settings
Update the Message Center Number
🍎 How to Change Message Center Number on iPhone
Apple doesn’t provide a direct settings menu for SMSC, but you can still view or update it using a dialer code.
Step-by-Step Instructions
Open the Phone app
Dial:
*#5005*7672#
→ This displays your current SMSC
To change it, dial:
**5005*7672*YOURNUMBER#
(Replace YOURNUMBER with your carrier’s SMSC)
Tap Call
You should see a confirmation message like:
“Setting succeeded”
⚠️ Important Notes for iPhone Users
Make sure the number includes the correct country code (e.g., +1 for the U.S.)
If the code doesn’t work, your carrier may restrict manual changes—contact support in that case
Common Issues & Fixes
❌ SMS Still Not Sending?
Try these quick fixes:
Restart your phone
Toggle Airplane mode on/off
Reset network settings
Reinsert your SIM card
❌ SMSC Won’t Save
Double-check the number format (include +country code)
Ensure you have network signal
Try the alternate method (dialer code vs settings)
❌ Dual SIM Problems
If you’re using dual SIM:
Make sure you’re editing the correct SIM slot
Set the correct SIM as default for SMS
How to Find the Correct SMSC Number
The safest way is to:
Visit your carrier’s official website
Contact customer support
Check your SIM documentation
Avoid random numbers online unless they’re from reliable sources.
Final Thoughts
Changing your Message Center Number might sound technical, but it’s actually a simple fix that can instantly restore your ability to send texts. If you’ve been stuck wondering why your messages won’t go through, this is one of the first things worth checking.
And if it still doesn’t work after trying everything here, don’t hesitate to contact your carrier—they can confirm whether the issue is network-related or account-specific.