Hi donmolly,
welcome to the Apple (user-to-user) Community!
Re: "Calling for Siri to do something the iPad picks it up but the iPhone I have will not respond"
Seems you must be needing Siri to respond on iPhone instead of on the iPad ?
To learn why that's not happening :
See Apple support's online article: How Siri works with multiple devices - Apple Support
Eg: says: Which device responds to your voice:
When you say "Siri" or ”Hey Siri” near multiple devices, the devices use Bluetooth to communicate with each other and determine which one should respond to the request.
The device that responds is the one that heard you best or was recently raised or used.
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What to do if the wrong device responds:
- Make sure that each device has Bluetooth turned on. If Bluetooth is turned off or a device isn’t in Bluetooth range of the other devices, multiple devices might respond to your request.
- Make sure that each device is using the latest Apple software. If some are using older software, multiple devices might respond.
- Make sure that "Siri" or ”Hey Siri” is turned on in Siri settings for each device.
- If you have an iPhone or iPad, you can place it face down so that Siri doesn't respond to your voice.
All the best :-)