Please tell us some basic information before asking for help:
Model Name: ZA55KL (X00RD)
Firmware Version: WW_Phone-15.07.2007.57-20200619
Rooted or not: Not
Frequency of Occurrence: Continuous Problem
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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Since past few days having issue with calls from Jio sim where the voice of other person is not proper and constantly drops, Vodafone works completely fine. I also tried the same Jio sim in other phones and it works well. The Jio sim is in 1st slot, Volte is already set up as well. There are no issues with Whatsapp calls.
