Messages number

To activate iMessage and FaceTime using your 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 ...

You may not have an SMS plan enabled by your carrier for the SIM that you use on your device. Apple Inc does not provide SMS services.

Please insert the SIM and wait for a while and restart the device if nothing has changed. That's it.

You do not have to input your number to send or receive SMS. Please check, you may not have an SMS plan enabled by your carrier for the SIM that you use on your device. Apple Inc does not provide SMS services. So please contact your Carrier.