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[TUTORIAL] How to change 3G frequency band from 900/2100 to 850/1900

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By walter11av, Member on 20th January 2013, 12:15 PM
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3rd September 2016, 04:44 AM |#21  
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I am using samsung grand maxSM-G7202 HOW I CAN select the band for lte
15th April 2017, 09:12 PM |#22  
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I Need Your Guide
Originally Posted by walter11av

Hello, this is my first post, sorry for bad English

after searching all over the web, trying to find the solution to change frequency band Samsung Galaxy Ace (GT-S5830L) from 900/2100MHz to 850/1900MHz

accidentally discovered it myself, I also discovered that is not limited by hardware, since the phone supports 4 bands (not all at once)


1) You must flash phone with original ROM eg. 2.3.6

2) Insert the SIM card, which is supposed to have 3G or H

3) When you have the phone with the original ROM, type *#197328640# then menu appears service mode. MAIN MENU

4) Select [6] COMMON, then select option [3] RF SCANNING.

5) For optimum scanning, should be on the outside (must come to the surface) to obtain the best possible signal,

6) When you are outside your home, select [2] RF START SCANNING, then wait about 15 seconds ... then go back and select option [4] RESULT TO SCREEN.

7) Then go back, pressing the menu key and then select back, several times, to get to MAIN MENU, then press the phone menu and select END.

8) You must dial *#2263# enter into preferred band selection, choose the option [2] WCDMA Band Preference, then select, [1] WCDMA 850[*], should be marked as follows:[*],

(if choosing an option fails 850[*] and thus leave, restart the phone, try again, or select AUTOMATIC)

I hope I have helped, I work myself perfect


Hola, este es mi primer post

después de haber buscado en toda la web, intentando dar con la solución de cambiar la frecuencia de banda de Samsung Galaxy Ace (GT-S5830L), desde 900/2100Mhz hacia 850/1900MHz pude conseguirlo

descubri que no esta limitado por hardware, ya que el teléfono soporta las 4 bandas (no todas a la vez) solo hay que escanear las bandas con el teléfono, para que las cambie.


1) Debe flashear el telefono con una ROM original ej. 2.3.6

2) Inserte la tarjeta SIM, con la que supuestamente deberia tener 3G o H

3) Cuando ya tenga el telefono con la ROM original, teclee *#197328640# , entonces aparecera el menu de service mode. MAIN MENU

4) Seleccione la opcion [6] COMMON, luego seleccione la opcion [3] RF SCANNING.

5) Para realizar un optimo escaneo, deberá estar en el exterior para obtener la mejor señal posible,

6) Cuando este afuera de su casa, seleccione la opcion [2] START RF SCANNING, luego espere unos 15 segundos... luego regrese, y seleccione la opción [4] RESULT TO SCREEN y seleccione con el menú select y poniendo el numero que corresponda a nuestra frecuencia.

7) Luego regrese presionando la tecla menu y luego elija back, varias veces, hasta llegar a MAIN MENU, luego presione la tecla menu del teléfono y elija END.

8) De nuevo debe marcar *#2263# para entrara en selección de banda preferida, elija la opcion [2] WCDMA Band Preference, luego seleccione, [1] WCDMA 850[*], debería quedar marcado asi:[*], o seleccione 900, según a que país corresponda.

(si no logra elegir la opción 850[*] y dejarlo de esta manera, reinicie el teléfono, intente de nuevo o elija AUTOMATIC) si logra dejar elegida la opción, debe reiniciar el teléfono, por las dudas

espero haber ayudado, a mi me funciono perfecto

I'm from indonesia. My phone is evercoss A76. original ROM v10 by Liu Jing., was broken by mistake, bootloop, and download from evercoss site support and get v08 and v10 by Wangel. after re flashing still bootloop and use customized boot.img by some out there. and success. but problem happen. signal loss but operator name was displaying.
When I open MTK Engineering App>Android settings>Phone Information, on the right corner I choose "select radio band" anI use automatic then I check on MTK settings>BandMode, I get the UMTS Mode for SIM 1 is different with Evercoss A66A*.

I need guide from you to add/change UMTS Mode to WCDMA-GSM-900.
I use your guide with *#197328640# and *#2263# but it's not working.
Please help me.
10th August 2018, 01:42 PM |#23  
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I buy mobile korean samsung note 3 my country is srilanka the band is supported i have signal full but some times cant get call and network not conected with full signal how can i fix my prob
12th January 2019, 01:48 PM |#24  
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Hello bro...
Originally Posted by JJM1974

Hello walter11av,

I purchased a Chinese version of galaxy S4 , but the 3G is WCDMA 850/2100 Mhz . I want to change it to WCDMA 850/1900 . Will your method work for my phone also ?

Please let me know . I am trying to fix this problem

Here are the specs on my phone.

Price Angels SKU : 594968
Phone Style 3G Smartphone
Phone Color White
Brand PA
Model i9500
Network Support(Band) 2G:GSM850/900/1800/1900MHz
3G:WCDMA 850/2100MHz
SIM Card Configuration Single Micro SIM
Card Slot Up to 32GB T-Flash card(Card Not Included)
CPU MTK6589 Quad Core 4*1.2GHz
Operating System Android 4.2.2
ROM 4G, NAND Flash

Hello buddy....were you able to choose/switch the desired frequency band? I need help because I have a galaxy s4 korean version and does not work on 900 mhz 3g but it has it on the hidden menu. I would like to be able to open that frequency because my operator works on 3g only with the band 900 mhz..How could I do it? Thanks
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