Extended range 5G configuration failure

  • 26 January 2023
  • 5 replies

Userlevel 1

Last year I joined T-Mobile.  The coverage map shows this area is covered by extended range 5G, but the T-Mobile 5G hotspot I got would only get 4G no matter what was tried.  Also leaving 5G enabled at all killed the 4G connection such that data completely dropped out for a second every 10 seconds.

I returned the hotspot and got a Samsung S22+  phone, since 4G data is throttled on everything but phones.

The Samsung S22+ had the same issue with extended range 5G, it wouldn't connect and I had to turn off 5G to get 4G working without the regular latency dropouts drops.


Both the hotspot and s22+ did work ok on other types of 5G, just not the extended range (band 71) available around my home.


Fast forward to this morning.  I managed to open a hidden phone settings menu on the Samsung S22+ using a dialer code, and was messing around.


Suddenly the phone connected to extended range 5G with 5 bars of signal showing.  It's been working on extended range 5G since then, even after resetting network settings and when travelling around the area in places covered by different extended range 5G towers.  Data speeds are up by over 1000%


This appears to be strong evidence that the devices provided by T-Mobile and also factory unlocked devices are not configured properly to work on the T-Mobile network!  Contacting T-Mobile customer support over the last year was useless... they'd tell me I was too far from the towers (but that's incorrect I'm getting 5 bars of 5G) and would tell me to reset network settings, reboot the phone, replace the sim card, and other stuff that did nothing to solve the problem.


Then something happened when using a samsung hidden menu to tweak the internal phone configuration that did fix the problem.


I hope this information helps T-Mobile serve their customers better. 

5 replies

What was the dialer code?

Userlevel 1


factory unlocked samsung s22+


idk if T-Mobile disables it on T-Mobile branded firmware phones or not

I just clicked "select all bands" and "apply band configuration" and N71 extended range 5G instantly came on at full bars


Userlevel 6
Badge +9

That's been a tool for use for quite some time on Samsung 

Userlevel 1

That's been a tool for use for quite some time on Samsung 

yes, I didn't know about it however until after Samsung disabled another "band selection" menu with an update.  The other menu was mostly useless as it turns out (probably why they disabled it)


I wonder why N71 SA extended range 5G wasn't enabled until I went into a hidden and undocumented service utility and manually enabled it?

Is/was T-Mobile handing out SIM cards that aren't programmed to enable standalone 5G?


Userlevel 1

That's been a tool for use for quite some time on Samsung 

There's another issue with standalone 5G I haven't solved yet.  5G on the phone seems to be designed for NSA (not standalone) and will constantly try to switch to a 4G channel rather than stay connected to the standalone 5G.   

If I disable all bands except N71 SA

the phone turns off 5G but can't connect to 4G and simply drops itself off the air.


Apparently they have a lot of issues to work out.