Lock LTE bands Qualcomm with root

Method 1: Lock the 4G network to Jio Band 40

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You can lock the device to a subset of its supported frequency bands on LTE, WCDMA, or GSM . Note that this operation will result in no service if you prevent the use of all bands that are available at the current location.

To find, lock, or erase an Android phone, that phone must: Be turned on.