How To Fix “REG99-Unable to connect” error on Samsung Galaxy S5

Samsung Galaxy S5 got launched with different versions in almost all the continents.Depending on the network provider,phones are customized according to the network bandwidth.

Well the error “REG99-Unable to connect” is only seen on T-mobile network as it’s a bit different from the international version.

Error REG99- Unable to connect

It’s an error directly related to Wi-Fi calling in the android system.

error "REG99-Unable to connect"

Problem faced by our blog readers :

Rachel :

I have been using WIFI calling since I got my Samsung galaxy  S5 and for the most part it has worked like a charm.  From past few days  I have been getting a weird error “REG99 – Unable to connect” quite repeatedly which is a bit annoying.  I’ve tried a few different WIFI networks from open network source to WEP security but nothing din’t really work.
 If I reboot the device then it  normally connects, and stay connected for a while but eventually it comes back and creates the same issue again and again as a loop.

Disclaimer : So after going  through the problem, I understood the glitch and came up with a solution which  may work on your Samsung Galaxy S5.

Procedure :

Switch off the device.
Press and hold the following three buttons simultaneously: 
  • Volume Up key
  • Home key
  • Power key

When the phone vibrates, let go of the Power key but hold on to press Volume up button + and the Home key until you see a Android recovery screen.
Use Volume Down key to highlight ‘wipe cache partition.’

Press the Power key to select  wipe cache partition.

 Reboot system now’ is highlighted.
Press the Power key to restart the device.
From T-Mobile:
That’s it.This should fix the problem.If it doesn’t you need to wait for an official Android update which will be fixing this “REG99-Unable to connect” error.

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