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How To Fix Samsung Galaxy S5 "REG99-Unable to connect" Error

By: Unknown | Monday, July 21, 2014


I've received at least a couple of emails from T-Mobile customers, who just got their Samsung Galaxy S5, asking for support as they were getting an error message, that according to them, they "never encountered before." It's the "REG99 - Unable to connect" error message, which occurs when they enable Wi-Fi Calling on their phone.

Apparently, this error message is related to Wi-Fi Calling and occurs only when the feature is enabled but it concerns your 911 address more than anything else. Here's a couple of emails I received about this issue, so far.

Hello Harold. I have a little problem with my new Samsung Galaxy S5. I'm in an area where cellular coverage is not really that good but cable internet is. So, I enabled Wi-Fi calling in my phone and it works just fine until I reboot it. The error message "REGG99 - Unable to connect" pops up frequently. I already called T-Mobile's tech support and it seems like the representative didn't know how to go about this and placed me on hold. I had to hang up. I was told by a friend you answer questions. Do you know how to fix this? -- Matty

Droidista,hello! It seems to me you have a lot of knowledge when it comes to Android, otherwise, you don't want to answer questions and resolve issues. Obviously, I have a problem of my own. I'm with T-Mobile and I just got my Samsung Galaxy S5 but whenever I turn on Wi-Fi Calling, I get the REG99 error. Don't have a clue how to address that. Help me please. Thank you! -- Robert

The common denominator, aside from being T-Mo's subscribers, in these emails is that both users just got their Galaxy S5, so they may not have setup or updated their T-Mobile accounts especially their 911 addresses.

Honestly, I'm not in the right position nor have sufficient knowledge with T-Mobile's processes. But if you haven't setup your account with your provider just yet, please do. Follow this link and enter your correct address and see if that solves the problem.

Alternatively, try wiping the cache partition of your Galaxy S5. I've been advised by a friend who works as a tech support in one wireless company in the U.S. that this procedure could solve the problem.

  1. Turn off your phone completely.
  2. Press and hold the Volume Up, Home and Power keys simultaneously.
  3. When the phone vibrates, release the Power key but continue holding the other two keys.
  4. When the Android System Recovery screen shows, you may let go of the Vol Up and Home keys.
  5. Highlight the option 'wipe cache partition' using the Volume Down key.
  6. Press the Power key to select it.
  7. When the wiping is complete, choose 'Reboot system now'.
  8. Press the Power key to reboot it.

If all these procedures fail, contact T-Mobile as they may need to send some information to your SIM phone. I hope this helps.

If you have problems with your Android phones, feel free to contact me at harold@droidista.com

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