How do I change my primary carrier on my iPhone?

The Default Voice Line is the primary line used for voice, SMS and Data.

  1. From a Home screen, navigate: Settings. Cellular. .
  2. Tap. Default Voice Line. .
  3. Tap the desired line (e.g., Primary, Secondary, etc.). Selected when a checkmark is present.

Is iPhone 4S dual SIM?

The Apple iPhone 4S is a single SIM (GSM) mobile that accepts a Micro-SIM card.

How do you check if your iPhone is unlocked?

How to Check If iPhone Is Unlocked in Settings

  1. Open the Settings app on the iPhone in question.
  2. Scroll down and tap General.
  3. Tap About.
  4. Scroll to the bottom and look for Carrier Lock. If it says No SIM restrictions, then your iPhone is unlocked and you’re free to use any carrier or cell service.

Can I put a European SIM card in my iPhone?

Virtually all modern smartphones (iPhone 7 and newer) are compatible with Europe’s mobile infrastructure and every major US carrier has international data plans — so your smartphone should automatically work once you arrive in Europe because the major US carriers have partnerships with local European carriers.

Why does my iPhone have a primary and secondary line?

You have done something related to your cellular plan. Two lines are related to Dual SIM.

How do I change my primary and secondary number on my iPhone?

Go to Settings. Tap either Cellular or Mobile Data. Tap the number you want to change. Tap each option and set it as you normally would.

How can I update my iPhone 4s to iOS 10?

On your device, go to Settings > General > Software Update and the update for iOS 10 (or iOS 10.0. 1) should appear. In iTunes, simply connect your device to your computer, choose your device, then select Summary > Check for Update. If there’s an update available, select Download and Update.

Is my iPhone GSM or CDMA?

In the About (iOS) or Status (Android) page, scroll down and check for a MEID, ESN, or IMEI number. If your phone has a MEID or ESN number, it uses CDMA, and if it has IMEI, it uses GSM. If you see both, that means your phone supports both GSM and CDMA networks.