Official Avira Support | Knowledgebase & Customer Support | Avira My Avira Account My Devices How do I register a new mobile to an existing Avira account? Follow You can register up to 50 devices in your Avira account. Register a new mobile Launch Google Play on the mobile you want to add to your account. Install Avira Antivirus Security. Register the mobile device using your Avira account credentials. The new mobile will now be added to your Avira account.