Tutorial "How To Change 3G To 4G on Android

How to change 3G to 4G on android phones with in Qualcomm Chipset Processor:

1. For open Engineering mode in qualcomm chipset processor phone download and install “Shortcut Master Lite app”.
2. Open it and click on Menu.
3. Search for “Service Menu” Or “Engineering Mode” and select it.
4. Now you can change the preferred network.
5. OR  Dial *#2263# then Select Menu and Click Back again then Select Menu.
6. Now go to Key Input and Enter “0000”, Select UE Setting from Popup.
7. Select the desired band by going : Configure Protocol>NAS>Network Control>Band Selection>LTE Band>

Switch between 2G / 3G / 4G LTE on android mobile phones with Mediatek Chipset Processor

If your device is used mediatek chipset processor then follow below steps to use 4g sim in 3g android mobile phones.

1. Download and install Mtk Engineering Mode app from play store.
2. Open it and click on “Mtk Settings”.
3. Under Telephony scroll down , to “Network selecting/Preferred Network” Option.
4. Now select the desired network from the list.

This above two method are good for those who want to use particular Frequency BAND like 2300MHz band 40 provides faster speed than the 1800Mhz band 3 and 850 Mhz Band 5. If you have inserted 4G sim card on a 3G phone