How do I set my Mobile Network to 4G only?

First, swipe up on the home screen, tap on the Settings icon, and tap on the Network & Internet selection. You should then tap on the Mobile Network menu and then tap on the Advanced option. Finally, tap on the LTE selection for 4G access .10 Eki 2021

Restart your phone. Once restarted, go to Setting –> More –> Mobile Network –> Preferred network mode, you will see LTE only option .1 May 2019

How to switch between 5G and 4G LTE on your iPhone 12