Hello. I have a Samsung Note 10+ and my son has an iPhone 11 on a Just Kids plan. I can't pair my Smart Family App with his Companion App. In order to pair, a text message is sent to my son's phone. However, my son gets the message, "You were unable to receive a text message due to a device restriction." He can receive other text messages. So how can I pair the app if my son can't receive the text message? Thanks.