Multi-choice problem: Continue writing the next sentence in this paragraph:

How to update carrier settings on an iphone
Connect to a wi-fi or mobile network.
Your iphone must be connected to the internet to access to download the file that contains your new carrier settings.
Use this method when you change network carriers, get a new sim card, or have been instructed by your provider that an update is available.

Available choices: (a). Add or remove a passcode to your iphone, and use your new carrier to update your mobile data. Go to https: // www.scribd.com/passcode/files/installers /. (b). Open the notification panel on your device. If you want to update your sim card onto your android device (if you are a v. (c). Connect a wi-fi or mobile network to your iphone. You can use this method if you have an iphone and have not yet updated your current carrier carrier. (d). In most cases, you'll see a pop-up on your iphone when your carrier settings should be updated. If you get such a message, tap update or ok to complete the update.
(d).