Active Level 3
By Samsung not providing LTE ONLY mode  , it provides LTE/3G/2G, OR 3G/ 2G, OR 3G ONLY, OR 2G ONLY, so in india tamil nadu vodafone 4G service ok if 4g signal problems like 1point it automatically switches into 3G which is not work, 

So we need 4G only mode 


This app provides to secretly change 4G only in settings,