Sending sms to a contact, but an unknown person receives it
So I just received my iPhone13 pro max today and its my first iphone ever, always had samsung. I understand iMessage, but i have a problem.
In settings, i enabled "send as sms when imessage is not available" because i know some of my contacts have androids. When i create an imessage for an android user, the arrow and contact name turn green, which i know means its going to send as a sms. But for one contact, as of right now, that i know has an android, it doesn't turn green when i send it to them. I dont really want to turn off the imessage setting completely off because for iphone to iphone i do prefer imessage.
So basically i want to know why for that certain contact it keeps sending as imessage. I tried deleting and recreating the contact and restarting my phone, but it still sends as imessage. So, id be thankful if anyone has a solution to this.
iPhone 13 Pro Max, iOS 15