Security research firm recommends that Android buyers stick to a Nexus or Samsung phone only
According to research firm Duo Labs, 75% of Samsung Galaxy S6 units received the May security update compared to the 0% that received the January update. Samsung Galaxy S5 phones were .2% patched in January compared to the 45% that received the May update. 75% of Nexus handsets have received the May security update.
Duo strongly recommends that Android users install each security update as it arrives. Because not every manufacturer is really pushing the security updates, Duo suggests that consumers looking for a secure Android phone limit themselves to Nexus and Samsung models only.
In a message to corporate IT chiefs, Duo says that corporations should develop policies to prevent vulnerable handsets from putting company data at risk of being hacked. By having strong corporate policies in place, IT personnel can determine which users are sporting Android phones that are vulnerable to attack. Most BYD'ers don't realize when their Android phone is vulnerable to an attack.
source: Duo via AndroidAuthority