When your iPhone sends incoming calls directly to voicemail or is disconnected after a ring, it might be due to various reasons. This can occur if the recipient's phone is powered off, in a low signal area, or if they have enabled the "Do Not Disturb" mode. Additionally, the contact's number may be blocked or marked as spam.

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STOP: Before doing anything that might cause data loss, make a backup of your iOS device to either iCloud, your computer, or both for extra security—> How to back up your iPhone, iPad, and iPod touch - Apple Support Check compatibility: