1.
we need to install this app for FREE
at Google Play
https://play.google.com/store/apps/details?id=com.teknokia.force4glteonly
pro version : https://play.google.com/store/apps/details?id=com.teknokia.force4glteonlypro
galaxy store: https://apps.samsung.com/appquery/appDetail.as?appId=com.teknokia.force4glteonly
pro version : https://apps.samsung.com/appquery/appDetail.as?appId=com.teknokia.force4glteonlypro
2. Run The Application - Choose SIM 1 Only Button
3. Choose Hidden Activity Then Waiting for Loading 100 %
4. Type "HiddenActivity" at Serach bar box
5. Choose Call setting App, expand it and you will find Hiddennetwork activity
6. click it you will go to Network Mode menu. select "LTE All " it will lock LTE Only with All LTE Band
7. if you want to Lock one LTE Band. Tap menu then Choose Band Selection . you need to select one frequency LTE Band that supoortted your mobile network operator.
8. Tap Toggle Selection to activate it.
This is Link APP Download
For detail Information please go to How to LOCK LTE Band On Samsung Galaxy Without Root
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