Official Avira Support | Knowledgebase & Customer Support | Avira My Avira Account My Devices Register a smartphone to your Avira account Follow Note You can register up to 50 devices in your Avira account. Register a smartphone Launch Google Play on the smartphone you want to add to your account. Search and install Avira Antivirus Security. Once the app is installed tap Log In and use your Avira account credentials. The smartphone will be automatically added to your Avira account.