Samsung S7 , my phone will ring once or twice and when I answer the call is dropped. The person on the other end hears a busy signal if I attempt to answer, if I don't they go to my voicemail. When I make a call, I hear it ring once or twice and then the call is dropped. When I am at home I can receive and make calls as long as I am inside so I am assuming the calls are being made via my wi-fi. Help would be great. Thanks!
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