Changing your number on an iPhone can feel a bit tricky at first. You typically need to contact your carrier to update the phone number linked to your SIM card. After your number is updated, restarting your iPhone usually reflects these changes. Sometimes, it helps to check your iMessage settings to ensure your new number is active there too. Do you often switch phone numbers, or is there a specific reason for this change? I'm here to assist if you have any questions.