PanicStation.org
UK USA
uk Technology & digital loss contacts disappeared • calendar events missing • contacts merged into one • duplicate contacts suddenly • calendar entries merged • phone contacts wiped • synced contacts missing • icloud contacts missing • google contacts missing • outlook contacts missing • calendar invitees changed • shared calendar changed • account sync glitch • data sync conflict • contacts overwritten • calendar disappeared after update • contacts disappeared after new phone • wrong account signed in • multiple accounts mixing • address book missing

What to do if…
your contact list or calendar entries disappear or merge unexpectedly

Short answer

Pause syncing and make a “snapshot” of what you’re seeing, then use the account provider’s restore/undo tools (often time-limited) before you try any manual clean-up.

Do not do these things

  • Don’t start bulk-deleting “duplicates”, “merging”, or “clean up contacts” prompts while you’re unsure what caused it.
  • Don’t keep toggling sync on/off repeatedly across multiple devices (it can overwrite a good copy with a bad one).
  • Don’t uninstall/reinstall apps or sign out of your account on every device as a first move (you may lose clues and recovery options).
  • Don’t assume it’s “gone forever” until you’ve checked the web version of the account and the provider’s recovery areas (Trash/Deleted/Data Recovery).
  • Don’t share one-time verification codes with anyone who contacts you about this (even if they claim to be “support”).

What to do now

  1. Stop the damage spreading (temporarily pause sync on the affected device).
    • Put the phone/tablet in Airplane Mode or turn off Contacts/Calendar sync for the account that seems involved (do this on the device that shows the problem first).
  2. Capture evidence of the current state (2 minutes, calm and boring).
    • Take screenshots of: missing/merged contacts, missing calendars, and any “sync”, “account”, or “storage” warnings.
    • Note the time you first noticed it and which device/app you were using.
  3. Check whether the data still exists in the account (use a browser).
    • Sign in on a computer (or browser on your phone) to your provider’s web interface (for example: iCloud.com, contacts.google.com, outlook.com People/Contacts, Google Calendar on the web).
    • If the web view looks normal, your issue is likely device sync/display (good news: avoid changing anything on the web while you stabilise the device).
  4. Use provider “restore/undo” tools (do this before manual edits).
    • iCloud (Contacts/Calendars): use iCloud.com “Data Recovery” to restore Contacts and/or Calendars to an earlier archived version.
    • Google Contacts: use Undo changes to roll back your contacts within the past 30 days.
    • Google Calendar (web): check Trash and restore events from there (deleted events stay in Trash for 30 days). If you deleted a recurring series using options like “this and following”, some items may not appear in Trash.
    • Outlook / Exchange / Microsoft 365: in People/Contacts, look for a Deleted folder (or check mailbox Deleted Items), then use Recover deleted / Recover deleted items if it’s available. If you can’t see recovery options, contact your system administrator.
  5. If it looks like accounts are “mixing” (common cause of unexpected merges): isolate which account is in charge.
    • On the device, check whether you’re signed into multiple accounts (personal + work/school, old + new).
    • Ensure Contacts/Calendar are set to the intended default account only, and that other accounts are not also syncing the same data.
  6. If you suspect someone accessed your account (treat this as a security incident).
    • Look for signs: password reset emails you didn’t request, new devices/sessions, forwarded emails/rules, contacts you didn’t add, calendar events you didn’t create.
    • Follow the UK NCSC guidance to recover a potentially hacked account: secure email first, change passwords, sign out of other sessions/devices, and enable two-step verification.
  7. If this is a work/school account, stop and involve the admin early.
    • Contact your organisation’s IT/helpdesk and tell them: “Contacts/Calendar items disappeared or merged; I have paused sync; please advise on restoring from admin tools/backups.”

What can wait

  • You do not need to manually rebuild your contacts or re-enter calendar events right now.
  • You do not need to “clean up duplicates” or re-merge anything until you’ve restored/rolled back.
  • You can postpone deciding whether to change devices, switch apps, or move providers.

Important reassurance

This is a very common panic-trigger because it feels irreversible, but many services keep time-limited backups (Trash/archives/undo). The safest approach is to pause syncing, restore from the provider, and only then tidy up.

Scope note

These are first steps to prevent further loss and maximise the chance of recovery. If you’re dealing with a compromised account, you may later want more detailed security support.

Important note

This guide is general information, not professional advice. Processes and recovery windows vary by provider and account type, and some actions can permanently overwrite data—when unsure, pause sync and use official restore/undo tools first.

Additional Resources
Support us