While an i OS update can (rarely) cause problems with your phone, it's virtually unheard of that a carrier settings update can cause any problems.
The increased polling rate does have a minor impact on battery life, depending on how often you lock and unlock your door with the Kevo App.
On average we expect users running the new firmware to replace batteries every 8-10 months.
When you do that, you'll be given the option to download the settings related to the new phone network connected to the new SIM. In most cases, the automated notification will do everything you need.
If you're using an i Phone on a network that's not one of Apple's official, supported partners, you may need to configure your settings manually.
The smaller updates (like 11.0.1) fix bugs and add minor features.
Updates to the OS affect the foundation of the entire phone.A push notification with just an OK button lets you know when that's happened.There's no button that lets you check for a carrier settings update the way you can check for a new version of the i OS.To do that, read Apple's article about cellular data network settings on your i Phone and i Pad. With i OS updates, Apple generally explains—at least at a high level—what's in each i OS update.With carrier settings, though, you won't find a screen that gives the same explanation.Carrier settings updates, on the other hand, are just small tweaks to a small group of settings and can't change anything other than how the phone works with a given cellular network.