Lock LTE bands Qualcomm with root

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

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

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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.