If you have an iPhone and you have updated to iOS 10.3.1 you’re safe. Every Android user has to be careful, thou.
Project Zero, Google’s division that deals with security, seeking vulnerabilities that hackers can exploit, gave the alarm on Tuesday, after Apple’s latest update. It seems that the problem is present in the Broadcom wifi chip used by all the smartphones makers: it is possible to take control of the device thanks to a rigged wifi network.
All updated iPhones are safe, while those who have yet to install the update, and anyone with an Android smartphone they better avoid to connect to public wifi and install a security update as it becomes available. Google is expected to release a patch before April, but given the inherent fragmentation in Android (because of dozens of smartphones makers in the market), it may take a long time until these updates are available to all.
If you want more information (with all the technical details), you can read the post at the Project Zero blog.