I have a relative who is currently travelling abroad. They are not using data roaming on their iPhone, but occasionally grab some hotel of coffee shop WiFi.

I have a problem communicating with them that is essentially as follows:

* When they message me using a data connection, I get an iMessage as I should
* If they are still on the data connection when I reply, they will receive it
* If they are not on a data connection, it will sent to me via SMS
* When I reply to that SMS, I know that they have left their iPad turned on at home, and thus all messages shows as *delivered* because they are getting to that device first, and not to her phone, ergo I cannot text her

Is there a way I can force a message to be sent to a recipient as an SMS message if they have their phone number configured to be a receiving address on a second device that is active and therefore receiving the messages over data first?