Hello,
Here are some of the steps to stop viruses attacking your phone :
1. You can download an antivirus application directly in your phone.
2. Make sure that you always choose a mobile from a recognized branded phone which comes with Imei number.
3. Scan your mobile: Once you download an antivirus application in your phone, remember to scan your mobile often to search for any virus.
4. Bluetooth is another way through which unknown applications or virus can make way into your mobile, so when in unknown places, it is better to turn the Bluetooth function off.