s21 ultra // 1st Sim card goes unreachable, when 2nd sim card is inserted

Bakhtiyar Aliyev

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Mar 5, 2023
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Who has any idea what is happening with dual sim s21 ultra?

1st Sim card goes unreachable, when 2nd sim card is inserted. Signal bars are on, but noone can reach the sim 1 number.

However right after calling out from sim1, it become shortly reachable again.

I noticed, when sim2 is in 3G mode, all works. But it automatically jumps into 4G, as soon as I switch to it. And then again sim1 goes off, issue repeats.

Device: Samsung Galaxy s21 ultra, SM-G998BZSGMEA.
 

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