Hack to prevent data dropping to 3G from LTE?

[noshooz]

is there a hack of some kind that will prevent data from switching from 4G LTE to 3G? I have two to three bars of signal but will sometimes have the data drop back to the slower speeds of 3G.

 

[anon(767240)]

Install telinfo from the playstore

Sent from my GT-I9505 using Tapatalk 4 Beta

 

[noshooz]

When I choose "LTE only", it's asking for a code labeled SMSC. Without it it won't take the change.