Assuming your service provider is not one of those who block Google's patches from coming to you directly you should probably charge up that device, get on WiFi  and check your available updates.  Any Google device running 4.4.4 or newer, including Nexus devices, will have up to 40 patches to slurp up.  Many of the patches are for a vulnerability similar to the previous Stagefright exploit, apps can use the drivers from Qualcomm and NVIDIA to break into the Qualcomm TrustZone on unpatched devices.  The Register provides a full list of the patches which are being pushed to Nexus and Android One devices.

"Google has today issued a bundle of 40 security patches for its Android operating system.

A dozen of the fixes correct critical vulnerabilities in versions 4.4.4 of the operating system and above. About 74 per cent of in-use Android devices run Android 4.4.4 or higher."

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