How do I unlock voicemail that says contact manager on an Android phone?
Answer
A carrier voicemail lock usually needs an AT&T voicemail reset after a simple phone restart; the phone owner or account manager must request it through official AT&T support.
Follow these steps
Restart the Galaxy phone
Power the phone off fully, wait 30 seconds, turn it back on, then open the Phone app voicemail tab or dial the carrier voicemail short code.
You should see: Voicemail opens, or the same lock message returns.
Confirm cellular service is normal
Check that the phone has AT&T signal and can place a regular call, since voicemail needs an active line.
You should see: Normal calling works while voicemail remains locked or also fails.
Request a voicemail reset from AT&T
Contact AT&T through official support, explain that voicemail is locked with a contact-manager message, and ask them to reset voicemail access.
You should see: AT&T unlocks or resets voicemail and gives any new setup PIN instructions.
Set a new voicemail PIN on first access
When voicemail opens again, complete greeting and PIN setup if prompted, and store the PIN somewhere safe offline.
You should see: Voicemail is accessible with a PIN you control.
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Extra tips
What to look for: A locked voicemail message such as 'contact manager', and whether the Phone app's Voicemail tab or dialing *86 fails
Before you change anything: Confirm you are the account holder or authorized user. Note the exact on-screen voicemail message. Have the wireless number and account PIN ready for AT&T. Never give voicemail codes to unexpected callers.