server unreachble problem after updating to oreo version

please help me on this issue beacuse when i am trying to call anyone after 3 minutes my call gets automatically disconnected why this problem is occuring…

server unreachble problem after updating to oreo version

please help me on this issue beacuse when i am trying to call anyone after 3 minutes my call gets automatically disconnected why this problem is occuring please give immediate and valid response.
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