REG 99 Unable To Connect On T-Mobile

Wi-Fi Calling is the future, and as a T-Mobile customer, I was overjoyed to learn that they were implementing WiFi Calling on their network.

Once this feature was rolled out in my area I decided to start to use this feature and I went to my smartphone setting and enabled the WiFi calling feature. And suddenly I received a message popping on my screen as REG99 Error – Unable To Connect.

The error message that I was getting was bothering me a lot, so I looked up how to fix it online.

I visited forums, blog posts, and other troubleshooting methods to compile a list of options to try to resolve this error.

I even spoke with customer service to figure out how to resolve the error on my phone and how to begin using the WiFi Calling feature on my phone. This article is based upon all the methods I used to fix this error message and if you are also facing the same issue then you can follow these methods.

Adding an E911 address to the line on which you want to use Wi-Fi calling will resolve the REG 99 error that appears when you try to turn on the feature. As a final check, make sure that VoIP services are not blocked on your router.

What Is Error REG 99?

If T-Mobile can’t find a valid E911 address in the number you’ll use to make a Wi-Fi call, you may receive this error message.

In the event of an emergency, having an E911 address helps dispatchers locate your location. Set up an E911 address before making calls on a network, and you won’t be able to do so without doing so.

Even if you have successfully set up an E911 address, you may still encounter this error. Fixes for those issues will be covered in detail as well, but don’t worry, I’ve made sure they’re simple to follow.

How To Setup E911 Address On A Line

If you don’t know how to set up an E911 address on your smartphone for a T-Mobile line, you can do so by following the steps below.

Access My T-Mobile by logging in. Master privileges must be granted to the line that changes the address.
From the top left, select your name.
Select The Profile.
Select a line from the dropdown menu Select Line.
Select E911 Address from the Line Settings menu.
In the provided field, type the E911 address. The address should be the primary location for which the line will be used.
Save your changes, and then repeat for each line that requires an E911 address.

Attempt to enable Wi-Fi calling again after you have configured the E911 address to see if the error reappears.

How To Fix REG 99 Unable To Connect on T-Mobile

If you haven’t been able to resolve this error message, you can try the troubleshooting methods listed below on your phone, which should resolve the issue.

Keep Your SmartPhone Updated

On some phones, Wi-Fi calling prerequisites the most recent version of the phone’s operating system. To fix the problem, see if there are any new software updates available for your phone.

Follow the below steps to install updates on iOS:

Connect your phone to Wi-Fi by plugging it into a charger.
Go to General in the Settings menu.
Tap the software update option.
Take whatever action the update page asks you to take and wait patiently for the update to finish.

Follow the Below Steps to Install Software Update on Android:

Open the Settings app, then scroll down to the bottom of the screen.
Navigate to the System > System update page.
If there are any software updates available, follow the onscreen instructions and allow your phone to download and install them.

Once you’ve completed a system update, restart your phone and check to see if the error occurs again.

Reboot Router

If your router malfunctions, Wi-Fi calling may be lost. The phone can’t communicate with T-network, Mobile’s resulting in the REG 99 error. Try restarting your router to fix it.

Follow the below steps to properly restart your Router:

Shut down your router.
It must be unplugged from the wall to function properly.
Remove the router from the wall for at least 30 – 45 seconds before plugging it back in.
The router should now be operational.

Try reactivating Wi-Fi calling and see if the problem persists.

Reset The Router

Then try resetting your router to factory defaults if a restart didn’t work. Any custom settings on your router, including the network name and password, will be lost if you perform a factory reset. After the router resets, you can re-set the ports.

See your router’s manual for specific instructions. It’s usually possible to reset a modem from the router’s back. Instead, you may need to access your router’s configuration interface to perform a reset.

Contact T-Mobile Customer Service

Contact T-Mobile if these troubleshooting steps do not work for you. Wi-Fi calling can be reactivated remotely if it was previously disabled. It is also possible to raise the priority of your problem if it cannot be resolved over the phone.

Order A New T-Mobile Sim Card

According to some people I spoke with, T-Mobile required a new SIM card to use Wi-Fi calling. Due to the lack of Wi-Fi calling support on some older SIMs, this method can work.

Alternatively, you can contact T-Mobile customer service or visit one of their stores. You’ll need to activate the new SIM on T-network Mobile’s after receiving it.

Wrap Up

If you don’t have good cell coverage, Wi-Fi calling is a good option. But keep in mind that the best results require a better than average internet.

T-Mobile says your Wi-Fi needs to be at least 2 Mbps to work properly. If you’re having trouble making a Wi-Fi call, move closer to the router and put off any network-intensive tasks.

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