Error 4: Invalid Teleservice ID is a text message failure that could occur on your Android device. You are likely to get it when you are using multiple SIM cards on your device.  You probably set the inactive SIM as the default SIM, therefore triggering the error.

However, you can fix this error with some operations. This guide will review what this error is, its causes, and possible solutions.

What is Error 4: Invalid Teleservice ID?

This error appears when your text messages fail to deliver on your mobile device. When it occurs, you will get the message; “message not sent” in the notification panel. However, when you see this error on your screen, you need to immediately look for a solution. 

What causes this Error 4: Invalid Teleservice ID?

Error 4: Invalid Teleservice ID usually occurs due to some issues with the SIM cards in your device. If you encounter it, you probably need to check if you set the inactive SIM as the default SIM. However, I have listed a couple of possible causes for the error below.

The receiver’s phone number is not correct
This may sound silly, but it is not wrong to check if the receiver’s phone number is valid. One number or two digits may be missing. Also, check if the receiver’s country is different. If it is and you are both in other countries, you need to add the country code. 

You have blocked the receiver
You may encounter this error if you try to text a blocked contact on your device. When this happens, you need to open the messages app and tap on Spam and then on blocked.  Tap on the option; More and open Blocked contacts to see the list of blocked contacts. Now you can remove the blocked contact from this list.

How to Fix Error 4: Invalid Teleservice ID

You can fix this error by performing simple operations in this guide. But before you start, here are some points you should check.

Check the message delivery report: You need to find out whether the message you sent has reached the receiver’s phone. You can do this by enabling SMS Delivery reports. To do this, you need to follow the guide below.

Step 1: – Access the Messages app and click on the three dots icon.

Step 2: – Now, click on Settings.

Step 3: – Click on Advanced and enable the ‘Get SMS delivery reports’ option.

If you are using a third-party app, you need to set the Messages app as the default SMS app and try again by opening the Messages app and tapping on ‘Set as a default chat app.’ 

Make sure that your carrier supports SMS/RCS messaging: Some carriers no longer offer text messaging support. You check your carrier website to find out if they support it.

Ensure that you have enough credit balance for sending messages: Even if your carrier supports it, you might not have enough credits to use your text messaging service. Check your current plan to see if text messaging is active on your SIM.

Make sure you are connected to a cellular network with a good signal by checking your signal strength and going to Settings. In settings, tap on About phone and open SIM status. 

If you could not fix the error after performing all these operations, try copying and resending the message again. If this did not work, you need to clear the Messages app’s cache by following the steps below.

• Step 1: – Tap and hold the Messages app and click on the ‘I’ icon. 
• Step 2: – Go to Store & cache and tap on ‘Clear cache’ to delete the cache.
• Step 3: – Now, check if you have fixed the error.

If the error is still occurring, you need to force-close the Messages app and open it again. But if this error is still there, move down to the potential solutions below.

Solution 1 – Updating your Messages app to the latest version 

Your messages app may be causing this problem because it is outdated. If this is the case, you need to update the Messages app from Google Play. If this solution did not work, you need to try the next potential solution below.

Solution 2 – Deleting the contact and adding it again 

This is another excellent solution for error 4. You can delete the contact by following the steps below.

• Step 1: – Open the Contacts app and tap on the contact.
• Step 2: – Go to the option ‘More’ and tap Delete. 
• Step 3: – Confirm the process by tapping on Delete again. 
• Step 4: – Now, dial the contact’s number on the Phone to add it again as a new contact.

Solution 3 – Turning Airplane mode ON and then OFF 

This is another solution that has worked for some users. You can try it out with the steps below.

Step 1: – Swipe down on your home screen and tap on the Airplane or Flight mode icon from Quick Settings.

Step 2: – Turn it OFF after a few seconds.

Solution 4 – Rebooting your phone

This is another solution that works for some people. You can also try it out. Just follow the steps below.

• Step 1: – Press and hold the power button for a few seconds.
• Step 2: –  Tap on Restart.

Solution 5 – Performing Factory Hard Reset

A factory reset of your phone is also a way to go if you want to fix this error. It would be best if you considered backing up your data before doing this on your Android Phone.

To reset your Android phone:

• Step 1: Open the settings option and locate Backup & reset
• Step 2: Tap Factory reset
• Step 3: Enter your password and erase all data on your device.
• Step 4: Reboot your device and restore all the data.

Conclusion

Error 4: Invalid Teleservice ID appears when your text messages fail to deliver on your mobile device. This error is not difficult to fix. Sometimes you would have to reset your Android phone to fix it.

This guide has given you the solutions to help you resolve this error. Now it’s your turn to perform these solutions and get rid of it.

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