Sporadic call for iPhone connection 6 w / IOS 9.3.4

Most of the calls on my iPhone 6 (IOS 9.3.4) download busy signal or switch immediately to voicemail, even when the phone is on but inactive. Reboot was no help. Only some callers on my list of Favorites seem to be able to connect. Some callers reported being disconnected immediately when the connection has been established, and there was no trace on my phone they had called.

Contact your operator.

Tags: iPhone

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