Apple error code 1035 related to Voicemail set up
What does error code 1035 mean? Trying to set VM message and it gives me error
iPhone 12 mini, iOS 14
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Voicemail is a carrier service. You need to contact your cellular network provider to resolve problems with it.
One thing to check on your own: Visual Voicemail requires a cellular data connection, it cannot use Wi-Fi, so verify that cellular data is on.