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The update may happen automatically once you insert the new SIM card.
But if not, you can go to Settings Who puts out the updates, and how are they delivered?
You may also get a message in i Tunes the next time you connect your device to your computer via USB.
If you notice any network issues or problems using such features as voicemail, it's a good idea to check that you haven't missed a carrier settings update using the steps outlined above before contacting your provider.
So I talked with Apple and all four major carriers — AT&T, T-Mobile, Sprint and Verizon — to get more information.Still, it's always good to keep an eye out for anything that seems fishy, like misspellings in the update message.There is certainly the potential that an update might end up breaking something or negatively affecting your device's performance.Another instance where a carrier settings update may occur is when you swap out SIM cards.
Let's say you've been using an unlocked i Phone on AT&T's network and decide to switch over to T-Mobile.
So you might be missing out on some features and a supposedly improved user experience.