How do I get a iPhone number?

I’m going to assume this is about an iPad and not about an iPhone based on the chosen footer, and that you want cellular data access.

Your footer here shows an iPad, and an iPad cannot be cellular telephone, nor can an iPad send or receive SMS or MMS messages. Only an iPhone or another cellular telephone can do that.

Confusingly, a cellular-capable iPad will have a telephone number when it has a cellular data plan, but that number cannot send or receive calls not MMS/SMS.

If you want cellular data with your cellular-capable iPad, then various carriers offer that service, and Settings > Cellular can help you get started obtaining cellular coverage.

Only an iPad with cellular can access cellular data. If you;re not sure, check for a SIM slot. If you have a SIM slot, you have a cellular-capable iPad.

More info: Set up cellular service on iPad (Wi-Fi + Cellular models) - Apple Support

If this really is about an iPhone and not an iPad, ignore this reply.

A phone number requires activation by your cellular provider (such as Verizon, and AT&T). For this, you will need to contact your cellular provider.

If you don't have a cellular provider or your iPhone is "unlocked" (meaning it can be used with any provider), you can do some googling to find a provider for you, or visit Wireless carrier support and features for iPhone in the United States and Canada - Apple Support for a list of carriers.

If you are wanting to identify which model of iPhone you have, visit this page. Identify your iPhone model - Apple Support

Hope I helped!

Ray

You sign up for cellular service from a cellular carrier... Get a SIM form them and insert it in the SIM carrier in the phone...