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Apple says that the new update will solve an issue with calls dropping. The new version of the software improves call drop performance on the older models.
It is nice to see that Apple is paying attention to how its phones perform, even though we haven't seen a lot of users complain about their new-model iPhones dropping more calls than normal.
If you have been having issues with calls dropping, you should update to 15.11.
You can update to the latest version of the software by going to settings. If you haven't been having any call issues, and you find updating to be a pain, then you should wait for the next version of the app, which has been packed with features. It would be understandable if you waited to go through the update process since Apple has not reported any major security patches in 15.1.1.
