Используйте приложение APKPure
Историческую версию 4G Switcher можно получить на Android
Force VOLTE и 4G в сети 3G / 2G.
Change Signal to only 4G. Especially for phones which don't have 4G/3G option and have only 2G/3G/4G.
Switch to this app for better signal of 4G or 3G.