I wish to enable Text Message Forwarding to send and receive SMS from my MacBook Pro (running macOS High Sierra 10.13.4). I remember having used this feature for a while with both iOS 10 and iOS 11 on my iPhone. However, when I try to enable it now, I can no longer see the option available under Settings app → Messages (I'm running iOS 11.3). It used to be available previously. I have only one Apple ID which I use for everything. I am logged in with it on both my MacBook Pro and my iPhone.
Is this feature removed in iOS 11.3? I remember using it after upgrading to iOS 11. I don't recall this option requiring some other setting to be enabled in iPhone. Here's the screenshot from the Messages setting. The Text Message Forwarding option is clearly missing:
How do I resolve this issue? As I compare the screenshot from my iPhone with the one provided in the Apple knowledge base article, it appears that Show Contact Photos toggle is missing too. Are these official/documented changes in the Messages app?