Problem with receiving calls Xiaomi redmi note 5

[Kennedy Santos Silva BR]

Dear, good afternoon, I have a problem with my Xiaomi redmi note 5, I can not receive calls when it is operating in 4G, only if I change to operate on 3G, it works normally ... How do I solve this problem? I'm new here on the forum, a big hug from Brazil! Information about my Xiaomi. MIUI Version: MIUI Global 9.5 | Stable | 9.5.19.0 (OEIMIFA) Android version: 8.1.0 OPM Model: M1803E7SH

 

[Pertti Kosunen]

Might have something to do with VoLTE, try switching it to another position.