I’m coming from a Samsung Galaxy S21 Ultra if it matters. I just got an iPhone 15 Pro Max and moved all my contacts to my new phone. I sent my friend a few messages and didn’t receive a reply but didn’t think anything of it. Then l later turned on my old phone to check something and there were replies to me from my friend. So he can see what I send him from my iPhone but his replies only go to my old phone. What can I do to fix this?