Can send but not receive text messages from one certain number on my S4?

The problem started on Saturday but I didn't realize it until today. I have been sending text message to one of my contacts and cannot receive text messages back. I am receiving text messages from other contacts. I can call and email this contact from my phone and it works fine. It's just receiving text messages. Any ideas?

Is the other person using an iPhone?

Do you have a data connection enabled?

Hi there, did you resolve this issue? I am having the exact same problem that you described, it even started on a saturday.. they are not on iphone and i have not added them to a block list, if anyone can assist it would be greatly appreciated.