If you have an iPhone or iPad, it's a good idea to always let your device stay up to date with the latest carrier updates.

• Go to "Settings"
• Tap "General"
• Tap "Software Update"
• Make sure "Automatic Updates" is toggled on

But if there's been a recent over-the-air update, you may need to accept new carrier settings when prompted.

• Go to "Settings"
• Tap "General"
• Tap "About"
• If you see a pop-up asking you to accept new carrier or network provider settings, accept the update