I don't have a separate phone number for my iPad
If I don’t have a separate phone # for my IPad, what good is it to me
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This is not a chat room - it’s a forum. You post your question and wait for a reply.
I note the timestamps of your two posts are only one minute apart; you are very unlikely to receive a reply within 60 seconds.
As to your question, an iPad, whether a Cellular model or not, is not capable of directly accessing Cellular Voice or SMS/MMS Messaging features. An iPad with either WiFi or Cellular connectivity alone can only access IP-data services.
However, If paired with an iPhone, the capabilities of iPad significantly broaden to include access to Cellular Voice and Messaging services of the associated iPhone - relayed to the iPad over WiFi using Apple’s continuity features.
More information about Continuity and the relevant Cellular services can be found here:
Continuity
Use Continuity to connect your Mac, iPhone, iPad, iPod touch and Apple Watch – Apple Support
SMS/MMS Messaging
WiFi Calling
Make a call with Wi-Fi Calling – Apple Support