How to forward calls in Android without extra application?

Question

In Nokia, I did it by typing *71003584012345678 where 71 for the unanswered calls, 00358 for the Finnish country code and the phonenumber 4012345678.
I know there are many applications for the task but I do not want to use them.



I heard that some Nokia Android phones and Sony phones have a builtin feature for the call forwarding in their phones.
However, I cannot find such a feature in my Oneplus.



Phone: Oneplus 3T

OS: Android 7.1.1


— Léo Léopold Hertz 준영 | Sources

Answer

I got the answer in Oneplus support chat




In that case, please Go-to phone app-> click the 3 grey dot right top corner-> click settings -> call setting-> select SIM 1 or SIM 2.




Output: as expected.
Details




  • Set your Smartphone to Airplane mode or switch it off if you want to forwarding to go directly to your second phone. Setting: unreachable call.


— Léo Léopold Hertz 준영 | Sources

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