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You notice that the subscription expiration date of your Trend Micro Mobile Security remains the same after renewal. This issue happens because the app is still using the old activation key. To resolve this, manually change the activation key to update the subscription.

  1. On your device, open the Mobile Security app.
  2. Tap > Settings > Renew / Activate, then tap tap here.

    how to change serial number

  3. Enter your new serial number, then tap OK.
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