HTC 10 and One M9 getting the October security update at T-Mobile

In case you haven't been notified on the update yet, you can try force push it onto your phone by heading to Apps / Settings, About, Software update, Check now. If doesn't show up on your smartphone, then you should try later since the update might be rolled out in stages.
While Samsung and HTC continue to deliver timely security updates, other handset makers are struggling to keep up with Google's patch releases. Not to mention that even Samsung and HTC don't offer the update each month for all their relatively new high-end smartphones.
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