I have a problem with receiving calls and text messages due to a weak 3G signal, now I want to make my phone and force it to work on the 2G mode only, but since I am on lollipop 5.0.1 I don't have this as a choice. I tried using this code: #*#*4636#*#* but it doesn't work with me. I also tried a few apps from the play store (e.g. Toggle Network Type 5.0 which was specifically made for Lollipop) but nothing works.

My phone is rooted.

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    On my 5.1.1 device I have it in Settings › Network › Mobile networks › Preferred network type, on my 4.4 device as well. There I can select between "LTE/3G/2G". I'd wonder why 5.0 shouldn't have that setting. Guess it's rather some Sammy-specific issue. – Izzy May 18 '16 at 12:44
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    This widget has nothing to do with my problem, I tried it yesterday. Even though thanks a lot for your effort – Mohdows May 18 '16 at 12:53

Some Samsung devices require root access to launch the hidden testing menu. The normal code will not work in the dialer; even with ADB, you don't have access to the menu.

Since you have root access, just type the following in a terminal on your phone and the hidden testing menu should appear:

su -c "am start -n com.android.settings/com.android.settings.TestingSettings"

It may be easier through my app Root Essentials that can do this and more. You can find that test menu under "Device Info".

  • That exactly what I needed, the application does the job, thanks a lot – Mohdows May 18 '16 at 20:10

The right code is *#*#4636#*#*. If this doesn't work then try to use an app from play store. It is called Phone Info Samsung. Another possible solution to your problem is described in this link, but it depends on the file structure of your OS.

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    @Mohdows did you pay attention to the order the asterisks and hashes appear? If so (and your input started with an * and not a #), what happens when you dial this code? – Izzy May 18 '16 at 12:24
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    @Izzy yes I did pay attention to the order; and I did even try other combinations to make sure that I am using the correct code, and for you information nothing happened when I dial the code. – Mohdows May 18 '16 at 12:28
  • @Mohdows OK – this time your details where clear as glass :) – Izzy May 18 '16 at 12:30
  • @andreas I've tried the application you mentioned above, but it doesn't give me anything useful. – Mohdows May 18 '16 at 12:44

Try it with the App called Radio Switcher. This works on my Blackberry Keyone

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