The official Security+OS update tracker page for Nokia smartphones has been updated on July 31 by HMD with details about the availability of only the July Security updates for all Nokia smartphones. The page lists Build number and details like whether it is just a security patch or firmware update + security patch for a particular device.
As per the updated information provided on the page, currently, July Security update is available for all Nokia smartphones except Nokia 3.2 and Nokia X71. Nokia 3.2 is on June Security update, while Nokia X71 is shown to be on May Security update. Nokia 4.2 received Dual-VoLTE support with July Security update and Nokia 3.2 users can expect the same.
In case the security update is not yet available for your Nokia smartphone, you should check the build number of your smartphone and confirm it with the information provided on the page. If the build number for a particular device is mentioned in the list then only it gets the update.
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