Simcard change
ve put my new sim in but my old number comes up when I text someone
iPhone 8, iOS 14
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To activate iMessage and FaceTime using your new Phone number
First, check to know whether you have an SMS plan enabled at least for One SMS with your carrier. Contact your Carrier (Cellular Service Provider) the agency that issued the SIM to you
If your iPhone is used with a carrier not found in the wireless carrier articles, make sure you can send and receive international SMS. (One SMS Only)
If you can't turn on or sign in to iMessage or FaceTime - Apple ...