What is USSD exploit ?
Unstructured Supplementary Service Data (USSD) is a protocol used by GSM cellular telephones to communicate with the service provider’s computers and Android smartphones may be vulnerable to the malicious USSD codes exploit which can wipe all the data off of your phone and SIM card ,any Android device running anything below Android 4.1.x (Jelly Bean) is vulnerable.
What you should do ?
Have the latest version of Android , Goto settings >>about phone>>software updates and click on check now button
1.Go to: https://www.mcafeemobilesecurity.com/dialer-protection/
from your mobile device
2.Click on the USSD vulnerability test link, If your IMEI (a 14 to 16 alphanumeric code) shows up, your device is vulnerable. Otherwise, you will only see *#06# on your dialer screen.
3.If the device is vulnerable, download the latest software updates provided by your device manufacturer and check again
4.If you are still vulnerable, the website has the link for you to download and install the free McAfee Dialer Protection app to protect against this vulnerability run the app and change the default dialler to MacAfee dialler .