Here's your signal to upgrade soon if you're still clinging to old Android phones running on Jelly Bean. The company will no longer support Android 4.1 to 4.3 Jelly Bean after August. The phones will still work, but you could lose access and support to apps over time as Google and its developers abandon this version.
Not many people will be affected by this change as less than 1% of Android users are still using handsets powered by Jelly Bean as of this month. But as GadgetMatch pointed out, it's good to not stick with using devices that feature too old versions of Android as developers tend to drop these in favour of working on newer features.