At some point my ability to make a three way call stopped working. I can "add a call" and they will answer and when I click merge they are dropped from the call. I never had a problem with this working until I upgraded to 5.1.1. Any ideas.
Updates are meant to enhance your phone not cause you headaches ck12074, so I understand your concern. Lets get this working again.
Have you rebooted the phone since the software update? Do you have Advanced Calling enabled on the phone?
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