Reject with Message Setup Error

[CraigS26]

I'm on AT&T ---- I made a New Message for "Reject with Message" and called my phone from Home landline. The Error Msg recd in a Text Msg was:
15554445555 Error. Invalid Number. Pls Re-Send using a valid 10-Digit mobile Nbr or Valid Short Code. Sorry, I'm not at my phone.

1-Phn # above was my Home Phone that called my Mobile. Last sentence was my created Msg.

Any ideas how to fix this.
Short Code and how to load is unknown to me.
Is there a location where your mobile phone # is defined manually or is that per Best Buy or AT&T software setup? Thanks!!

 

[Glock23-G4]

Re: Reject w Message Setup Error

The error is because you can't send a text message to a landline. Try it again from a mobile number and it should work.

 

[CraigS26]

Re: Reject w Message Setup Error

The error is because you can't send a text message to a landline. Try it again from a mobile number and it should work.

I thought there might be a text-to-voice feature that would be heard from a landline. Thanks for the clarification.